Under the Thames to Longitude Zero: Maritime Greenwich, London

Walk beneath the river to the Cutty Sark, Wren's Painted Hall and Nelson's last journey, then climb the hill to the Prime Meridian, where London taught the whole world to tell the time

London · 10 stops · 25 min audio · Generated October 2026

1. 1. Island Gardens & the Greenwich Foot Tunnel

   Saunders Ness Road, London E14 3EB, United Kingdom

   Stand at the railings of this little riverside garden on the tip of the Isle of Dogs and take in the view across the grey-green Thames: two white domes, long colonnades, a small white house tucked between them, and an old observatory on the green hill behind. You are looking at three centuries of British sea power, arranged like a stage set... and you have the best seat in the stalls.

   The view is no accident. When Christopher Wren designed the great hospital for old sailors on the far bank, he split it into two halves so that the little Queen's House would keep its view down to the river. And around 1750 the Venetian painter Canaletto, then working in London, painted this very scene from this side of the water. His picture hangs today in the National Maritime Museum, a short walk from the place it shows. The garden around you opened to the public in 1895, and the view has been protected ever since.

   Now turn to the round brick building with the glass dome. That is the northern entrance to the Greenwich Foot Tunnel, opened in 1902. Before it, thousands of dockers and shipwrights who lived in Greenwich crossed to the West India Docks by ferry, and a ferry could be stopped by fog, ice or a bad tide. The engineer Sir Alexander Binnie drove a cast-iron tube through the clay beneath the riverbed instead, about three hundred and seventy metres long and lined with white glazed tiles. It has carried walkers ever since.

   Go down the spiral staircase and listen. Every footstep rings off the tiles. Near the northern end, the tunnel suddenly narrows, and the tiles give way to a thick lining of steel and concrete. That is a wartime scar: the repair of bomb damage from the Second World War. Commuters hurry through it every morning, most of them never wondering why the walls close in around them just there.

   So follow them. Walk under the Thames, climb out through the twin domed rotunda on the south bank, and you will find yourself almost at the foot of a tall black ship with gilded carving on her stern, the most famous sailing ship in London, moored so close to the tunnel that she seems to be waiting for you.

2. 2. Cutty Sark: The Clipper That Floats on Glass

   King William Walk, London SE10 9HT, United Kingdom

   Walk right round the black hull until you can see underneath her... yes, underneath, because this ship floats on nothing but air and glass. The Cutty Sark sits raised about three metres above the floor of her dry dock, so you can stand beneath the gleaming metal-sheathed keel of a ship that raced across every ocean on earth.

   She was launched in 1869 at Dumbarton on the River Clyde, built to bring the new season's tea from China as fast as the wind allowed, because the first cargo to reach London fetched the best price. And here is the cruel joke of her life: in that very same year, the Suez Canal opened. Steamships could now take the short cut through Egypt, where sailing ships could not easily follow, and within a few years the great tea races were over. The finest clipper of her age was out of date almost from the day she was born.

   She found her glory in another cargo instead: wool from Australia. Under Captain Richard Woodget, in the late 1880s and early 1890s, she made some of the fastest passages of her day and famously showed her stern to steamers. Then she was sold to Portuguese owners in 1895 and sailed for decades under another name, Ferreira, until a retired sea captain, Wilfred Dowman, bought her back in 1922. Since 1954 she has rested here in Greenwich.

   On 21 May 2007, during a long conservation project, fire swept through the ship. The pictures on the news looked like the end. But much of her original timber and ironwork had already been taken away for repair, so most of the historic fabric survived. She reopened in 2012, lifted into the air on her new steel supports, which still divide opinion among sailors and architects.

   Before you go, find the figurehead: a woman in a short white shift, one arm stretched out. She is Nannie, the witch from Robert Burns's poem Tam o' Shanter, and cutty sark is old Scots for that short shift. In the poem she grabs the tail of Tam's mare as he gallops away, and the story goes that sailors would put a tail of old rope in her hand. Now head south, past the market streets, to the great stone church with giant columns on Greenwich Church Street.

3. 3. St Alfege Church: An Archbishop, a Composer and a General

   Greenwich Church Street, London SE10 9BJ, United Kingdom

   Stand in front of the east end of this church, facing the massive portico with its four giant columns, and notice how heavy and theatrical it feels for a parish church in a riverside town. Stone as drama, weight as a statement: that is the signature of the architect Nicholas Hawksmoor, Wren's brilliant and moody assistant.

   The name goes back a thousand years. In 1011 a Viking army captured Ælfheah, Archbishop of Canterbury, and held him prisoner in their camp at Greenwich, demanding a huge ransom. He refused to let his poor tenants pay it. In April 1012, during a drunken feast, the Danes pelted him with bones and ox skulls, and then one of them finished him off with an axe. Tradition says the church stands on the spot where he died, and the English have honoured him ever since as Saint Alfege.

   The medieval church that stood here before saw remarkable things. Henry the Eighth, born in the royal palace by the river in 1491, is said to have been baptised inside it. Thomas Tallis, the great composer who served four Tudor monarchs in the Chapel Royal, was buried in its chancel in 1585. Then, one stormy night in 1710, the old roof collapsed. The parish begged Parliament for help, and the new church, finished around 1714, became the first of the Fifty New Churches that Queen Anne's government promised London.

   Beneath the floor lies another Greenwich man: General James Wolfe, who captured Quebec from the French in 1759 and died in the hour of his victory. His family lived on the edge of Greenwich Park, so his body was brought home and laid in the family vault here. You will meet him again, in bronze, at the top of the hill.

   In 1941 a German firebomb set the roof alight and the interior burned. It was carefully restored after the war, and today the church holds concerts in memory of its great composer. Behind you, across the road, the covered Greenwich Market has traded in this block since the days when its rents helped pay for old sailors. Now walk east along College Approach and through the gates of the Old Royal Naval College.

4. 4. The Painted Hall: Britain's Sistine Chapel

   King William Walk, London SE10 9NN, United Kingdom

   Walk into the Painted Hall and let your eyes climb, because the walls and the ceiling around you are one gigantic painting: gods and monarchs, virtues and vices, sea gods, ships and the signs of the zodiac, all swirling up towards the light. People call it Britain's Sistine Chapel, and for once the cliché is fair.

   It was meant to be a dining hall for old and injured sailors. In 1694 Queen Mary the Second founded the Royal Hospital for Seamen here, a sailors' answer to the soldiers' hospital at Chelsea, and Christopher Wren designed it, reputedly without taking a fee. But the hall turned out so grand that it seems the pensioners rarely ate in it at all, and they took their meals in the rooms beneath.

   The painter was James Thornhill, later the first English-born artist to be knighted, and the work took him nineteen years, from 1707 to 1726. He was paid by the square yard: three pounds for the ceiling, a single pound for the walls. Find William and Mary enthroned in the heavens of the main ceiling, then the Hanoverian kings who arrived on the throne while he was still up on the scaffolding. And on the far wall of the upper hall, Thornhill painted himself, one hand gesturing towards his work... as if to remind the paymasters how much he had done.

   In January 1806 the hall became a place of national mourning. Admiral Lord Nelson, killed at Trafalgar, had been carried home preserved in a cask of spirits, and here he lay in state for three days. Tens of thousands of people queued in the winter cold to file past the coffin. Then it was taken up the river by barge for a state funeral at St Paul's Cathedral.

   The sailors' hospital closed in 1869, the Royal Navy trained its officers in these buildings from 1873 until 1998, and a long restoration of the ceiling was completed in 2019. Now cross the Grand Square to the twin dome on the other side. Its interior is the Painted Hall's opposite in almost every way.

5. 5. Chapel of St Peter and St Paul

   King William Walk, London SE10 9NN, United Kingdom

   Step through the doors under the eastern dome and the temperature of the place changes: after the Baroque thunder of the Painted Hall, here everything is cool and delicate, pale blue and cream and gold, with plasterwork as fine as the icing on a wedding cake.

   The two domes look like twins, and they were meant to. Wren split the hospital into two halves to keep the view from the Queen's House open to the river, so the chapel on this side answers the hall on that one. But the interior you see is not Wren's. In January 1779 a fire gutted the original chapel, and the rebuilding fell to the architect James Stuart, nicknamed Athenian Stuart because he had measured the ruins of ancient Athens, working with William Newton. The new chapel was finished in 1789, and it is one of the finest Georgian Neoclassical interiors in Britain.

   Look above the altar at the enormous painting by Benjamin West, the American-born artist who rose to become President of the Royal Academy. It shows Saint Paul after his shipwreck on Malta, calmly shaking a viper from his hand into the fire. A shipwreck and a survival: the perfect sermon in paint for a congregation of sailors. Up in the gallery, the organ by Samuel Green belongs to the same rebuilding.

   Picture the men who once filled these pews. Old seamen in blue coats and three-cornered hats, many missing a leg, an arm or an eye, some of them veterans of the great sea battles against France. At its height the hospital was home to more than two thousand of them, the Greenwich pensioners, and Sunday service here was the fixed point of their week.

   Weddings, concerts and services still take place under this ceiling, and the acoustics make even a single voice sound like a choir. When you come out, walk down to the river and follow the Thames path east, past the college railings, to an old tavern with tall bow windows hanging over the water.

6. 6. Trafalgar Tavern: Whitebait and Dickens by the River

   Park Row, London SE10 9NW, United Kingdom

   Follow the river wall until you reach the building with tall bow windows jutting over the water like the stern galleries of a warship. This is the Trafalgar Tavern, built in 1837 and named, of course, after Nelson's last and greatest victory. It was designed so that diners could eat with the Thames sliding past almost beneath their feet.

   In Victorian times this stretch of river was famous for one dish: whitebait, tiny young fish caught in the Thames, fried crisp and eaten whole by the plateful. Every summer, at the end of the parliamentary session, government ministers came down the river to Greenwich for a whitebait dinner, a ritual that lasted for much of the nineteenth century. The story goes that the Liberals favoured this tavern while the Conservatives preferred another inn nearby, so that even the fish course had a party line.

   Writers came too. Charles Dickens knew the Trafalgar well, and it is often said to be the model for the Greenwich inn where Bella and John Rokesmith hold their wedding dinner in Our Mutual Friend, his last completed novel, a feast of fish served dish after dish by the river. Thackeray and Wilkie Collins are said to have dined here as well.

   Behind the romance flowed a filthy river. In the hot summer of 1858 the Great Stink made the Thames so foul that Parliament finally paid for Joseph Bazalgette's great sewers, and the whitebait grew scarce in these waters. The ministers' dinners faded away, and the tavern itself spent long years in the twentieth century doing other jobs before it became a pub again. The view, though, is exactly the one Dickens saw.

   Lean on the river wall outside for a moment and look west: the masts of the Cutty Sark, the two domes, the long bend of the Thames towards the City. Then turn your back on the water, walk south along Park Row, cross Romney Road, and look for a perfectly white house standing alone on the lawns... the first truly classical building in England.

7. 7. The Queen's House and the Tulip Stairs

   Romney Road, London SE10 9NF, United Kingdom

   In front of you stands a crisp white villa, almost a perfect box, with long rows of windows and a balcony on the first floor. After the rambling Tudor brick palaces, this was something England had never seen: a house designed by strict classical proportion, the first of its kind in the country.

   Its architect, Inigo Jones, had walked among the ruins of Rome and studied Palladio's villas in Italy. He began the house in 1616 for Anne of Denmark, the wife of King James the First. Legend says James gave her Greenwich as an apology, after he swore at her in public because she had accidentally shot his favourite hound while hunting. Anne died in 1619 with the house unfinished, and building stopped. It was completed in the 1630s for another queen, Henrietta Maria, wife of Charles the First, who called it her house of delight.

   Strangely, it was built straddling the main road from Deptford to Woolwich, which ran right through it. The house began as two blocks joined by a bridge over the road, so that the queen could pass from the palace gardens into the park without ever touching the mud. The long colonnades beside it, added in the early nineteenth century, still follow the line of that vanished road. Inside, the great hall is a perfect cube, and to one side curls the Tulip Stairs, the first geometric self-supporting spiral staircase in Britain.

   And those stairs come with a ghost story. In 1966 a retired clergyman from Canada, the Reverend Ralph Hardy, photographed the empty staircase. When the film was developed, it seemed to show one or two shrouded figures gripping the rail and climbing. The story goes that experts checked the negative and found no sign of tampering. Treat it as a legend... but many visitors linger on those steps longer than they planned.

   Today the house is an art gallery for the maritime collection, and its star is the Armada Portrait of Elizabeth the First, her hand resting on a globe while the Spanish fleet is wrecked behind her. Now walk west along the colonnade to the large museum next door, where the treasures of Britain's seafaring past are kept.

8. 8. National Maritime Museum: Nelson's Coat and a Ship in a Bottle

   Romney Road, London SE10 9NF, United Kingdom

   Before you go inside, find the giant ship in a bottle by the museum's newer entrance: a model of Nelson's flagship, HMS Victory, its sails cut from brightly patterned printed cotton of the kind sold in West African markets. It is the work of the artist Yinka Shonibare. It first stood on the Fourth Plinth in Trafalgar Square, and in 2012, after a public fundraising appeal, it sailed home to Greenwich.

   Those patterned sails are the point. The fabric looks African, yet its story runs through Dutch and British factories and colonial trade routes, and so a single sculpture asks who really profited from the empire that Nelson's navy protected. The museum behind it has been asking such questions more and more openly in recent years.

   The National Maritime Museum opened in 1937, inaugurated by King George the Sixth, in buildings that had been a school for the sons of seamen. Much of its founding collection was paid for by Sir James Caird, a Scottish shipowner from Dundee, and today it holds one of the largest maritime collections in the world: charts, globes, uniforms, figureheads, paintings, and the papers of explorers.

   The most moving object may be a coat. In a glass case lies the full-dress uniform coat Nelson wore on the deck of the Victory on 21 October 1805, with a small hole in the left shoulder where a French marksman's musket ball struck him. The story goes that he refused to cover the glittering stars of his orders, which made him easy to spot. He died below decks a few hours later, as the battle was being won.

   The museum also owns Canaletto's view of Greenwich from the far bank, painted from close to the garden where your walk began. Then leave by the park side and take the steep path up the hill, towards the red ball on a mast on top of the old observatory.

9. 9. Royal Observatory and the Prime Meridian

   Blackheath Avenue, London SE10 8XJ, United Kingdom

   Catch your breath at the top of the hill and look at the courtyard of the Royal Observatory: a metal line runs across the stones, and people queue to stand with one foot on either side of it, one in the eastern hemisphere, one in the western. This is the Prime Meridian, longitude zero, the line from which the whole planet measures east and west.

   The observatory was founded by Charles the Second in 1675 for one urgent purpose: to help sailors find their longitude at sea, where a wrong guess could put a ship on the rocks. Christopher Wren, himself an astronomer before he was an architect, designed the first building, Flamsteed House, named after John Flamsteed, the first Astronomer Royal. Wren said it was built for the observer's habitation and a little for pomp.

   Now look up at the red ball on the mast above the building. That is the Time Ball, installed in 1833. Every day it rises halfway, then to the top, and at exactly one o'clock it drops. Ships' officers on the Thames watched for it to set their chronometers, and it is one of the earliest public time signals in the world.

   Why Greenwich, and not Paris? In 1884 delegates from twenty-five nations met in Washington for the International Meridian Conference. Most of the world's shipping already used charts based on Greenwich, so the vote went twenty-two to one, with San Domingo against and France and Brazil abstaining. France kept the Paris meridian for its own clocks until 1911. And the twist: the line at your feet follows George Airy's telescope of 1851, but satellite measurements place zero longitude about a hundred metres to the east, out on the grass of the park.

   Beside the observatory, on the edge of the slope, a bronze soldier gazes out over London: General James Wolfe, a gift from Canada unveiled in 1930, his pedestal still pitted by bomb splinters from the Second World War. Wolfe's family home stood at the far side of the park, so follow the avenue south, then bear right along the park's western edge, to the red-brick house where the walk ends.

10. 10. Ranger's House and Queen Caroline's Bath

    Chesterfield Walk, London SE10 8QX, United Kingdom

    You have reached an elegant red-brick villa on the edge of the park, with long windows and a curving bay at its side. It was built in the early 1700s for a naval officer, Francis Hosier, and in the nineteenth century it became the official residence of the Ranger of Greenwich Park, which is how it got its name.

    One of its owners was Philip Stanhope, the fourth Earl of Chesterfield, statesman and wit, whose letters of advice to his son on manners and worldly success were published after his death and read for generations as a guide to polite behaviour. He added the bow-windowed gallery, and the lane outside still carries his name: Chesterfield Walk. A few doors away stands Macartney House, where the family of General Wolfe made their home.

    Inside today is a treasure most Londoners have never heard of: the Wernher Collection. Sir Julius Wernher was a German-born financier who made a fortune from the diamond fields of South Africa in the late nineteenth century, and he spent it on beauty: Renaissance jewels, medieval ivories, enamels, bronzes, paintings and porcelain, around seven hundred works of art. Ornate, slightly strange and utterly dazzling, it is one of the great private collections of its age.

    Now look along the old garden wall nearby for a small sunken rectangle in the ground: Queen Caroline's Bath. Caroline of Brunswick, the estranged wife of the Prince Regent, the future George the Fourth, lived next door in Montague House in the early 1800s. Gossip about her lively parties grew so loud that in 1806 the government held a secret inquiry into her conduct, the so-called Delicate Investigation. Her husband had her house pulled down in 1815. Only the plunge bath survived.

    And so the walk ends among the houses of people who lived on the edge of history: a sea captain, a master of manners, a general's family, a queen who was never crowned. You crossed under the Thames, followed Nelson's coffin and stood astride the line that divides the world in two. Blackheath opens behind you, and the park runs back down to the river. Whichever way you go, Greenwich will make sure you know exactly what time it is.