Reading London's Layers: How to See a City That Refuses to Erase Itself

Most great cities replace themselves. Paris flattened its medieval lanes in the 1860s to make boulevards. Rome buried its imperial forum under a thousand years of pasture. New York demolishes faster than it builds. London does not work this way. London leaves the old thing in place and builds the new thing on top.

That habit is the reason the city is hard to read at first glance and immensely rewarding once you know what to look for. The street under your feet may be a Roman road, surveyed in the second century, paved over twenty times since, still tracing the route it traced before there was an England. The pub you are standing in front of may be a 1667 rebuild of a 1577 inn that sat on top of a thirteenth-century monastery. The office tower next to it may be 2014 glass wrapped around an art-deco bank skin that wrapped around a Wren church that wrapped around the medieval parish chapel that burned in 1666.

This is the rule. The layers are not erased. They are stacked.

The seven layers

There are seven historical strata visible in London if you train your eye. Every walking tour in the city is some combination of these layers.

Roman (43 to 410). The Romans founded Londinium around the year 50 and walled it in the late 100s. The wall ran from Tower Hill to Cripplegate and back to Blackfriars, defining the boundary that is still called the City of London today. Fragments of the wall survive at Tower Hill, at the Museum of London, behind the Old Bailey. Roman pavements lie beneath All Hallows by the Tower, beneath the Guildhall, beneath Leadenhall Market where the basilica once stood. The geometry of the modern Square Mile is Roman geometry.

Saxon (410 to 1066). When Rome withdrew, Londinium emptied out and a new settlement grew west of the wall, called Lundenwic. By the late ninth century, Alfred the Great moved the population back inside the Roman walls for defence against Viking raids. The Saxon arch at All Hallows by the Tower, dated to 675, is the oldest standing piece of London above ground.

Norman and medieval (1066 to 1485). William the Conqueror built the Tower of London in 1066 as a fortress against the city he had just taken. The medieval City that grew around it was a tight grid of guild halls, parish churches, narrow lanes, and timber-framed houses. Almost none of it survived. What did survive is the street pattern, the parish boundaries, and a handful of buildings that escaped the Great Fire: the Tower itself, parts of the Guildhall, the Temple Church, Westminster Hall, and a few outliers.

Tudor and Stuart (1485 to 1666). This is the layer Shakespeare knew. London grew rich and crowded, theatres opened on the South Bank because the City would not license them inside the wall, and the Banqueting House on Whitehall introduced classical architecture to England in 1622. Most of this layer also burned. The George Inn in Southwark and the rebuilt Cheshire Cheese on Fleet Street are rare survivors that show what the medieval and Tudor city actually looked like.

Wren and the long eighteenth century (1666 to 1837). The Great Fire of September 1666 burned down four-fifths of the City inside the wall. Thirteen thousand houses, eighty-seven parish churches, Old St Paul's. The rebuild was Christopher Wren's. Wren designed fifty-one new churches and the new St Paul's, completed in 1710. The layer he laid down is the Portland-stone, classical-proportion, white-spire London that is still the iconic look of the historic core. The Monument to the Great Fire, the Bank of England's founding in 1694, the coffee-house culture that became Lloyd's and the Stock Exchange, all sit in this layer.

Victorian and Edwardian (1837 to 1914). Britain in the nineteenth century was the world's largest economy and London was the largest city on earth. The Victorians put a rail network, an underground, a sewerage system, Tower Bridge, Leadenhall Market, and most of the city's surviving pubs in place. They also imitated every earlier layer in their new buildings. Tower Bridge is a steel-framed 1894 machine wrapped in medieval costume. The Bank of England got rebuilt in the 1920s and 30s in classical revival. Reading the Victorian layer is largely a matter of seeing where the costume ends.

Blitz and postwar (1940 to today). From September 1940 to May 1941, the Luftwaffe dropped roughly twenty-eight thousand tons of high explosive on London. The City was hit hardest on the night of 29 December 1940, when seventy percent of the historic core caught fire. St Paul's survived because a volunteer watch crawled across the smouldering dome timbers and put the fires out by hand. Almost everything around it did not. The South Bank was a wasteland of rubble for ten years. What replaced the rubble is the seventh layer: the Festival of Britain in 1951, the South Bank Centre, the Barbican concrete towers, the Lloyd's of London building, the City of London office canyons, the Shard, the Walkie-Talkie. The postwar layer is the only one where you can name the architect and the year for almost every building.

How to read the stack on the ground

The seven layers are not stacked neatly. They cluster. The City of London inside the Roman wall holds the densest concentration of every layer at once. Westminster, a mile to the west, is mostly medieval-through-Victorian because the Fire and the Blitz hit it less. The South Bank is mostly Tudor and postwar because almost everything between burned or was bombed. The East End beyond the wall is mostly Victorian terraces overwritten with postwar council estates and twenty-first-century towers.

If you stand at the foot of the Monument near Pudding Lane and turn slowly, you can see five layers at once. Roman pavement underneath you. Medieval street pattern around you. Wren-era column above you. Victorian Leadenhall to the north. Twenty-first century towers behind. None of it accidental. All of it stacked.

Why the layers survived

London preserves by accident more often than by intent. The Fire of 1666 burned down four-fifths of the medieval city, but the property lines did not change, because the legal owners of those plots survived the fire and rebuilt on the same outlines. The Blitz flattened the financial core, but St Paul's survived because of volunteer fire-watching, and the Bank of England survived because its vaults were too far underground to burn. The South Bank was rebuilt as a cultural quarter only because the 1951 Festival of Britain planted the Royal Festival Hall on the bomb site and the planners then refused to give the land back to industry.

Even the things that got demolished mostly got demolished slowly. The Palace of Whitehall, once the largest palace in Europe with fifteen hundred rooms, burned in 1698 and was simply not rebuilt. Its only surviving fragment is the Banqueting House, where Charles the First was beheaded in 1649 directly beneath the Rubens ceiling he had commissioned to glorify the divine right of kings. That one detail holds the whole logic of the city. The building stays. The meaning of the building changes.

What this means for a walk

Every Roamer London tour is built around one of these layers and uses the others as background. The City of London tour walks the Roman-medieval-Wren stack from Tower Bridge to St Paul's. The Westminster tour walks the medieval-through-Victorian half-mile of British state power. The Pub History tour walks five Tudor-and-Stuart survivors that watched the city burn around them and reopen the next year. The Dark London tour walks two thousand years of how the city buries and forgets and gets caught remembering. The South Bank tour walks the bomb-site-to-cultural-quarter inversion of the seventh layer.

You can walk any London street and read at least three layers at once. Knowing they are there is the trick. Knowing how to name them, the second.