The signs of a long buried road can still be found hidden beneath a London sewer grate.

Its collection includes a broad array of social, geographic, graphic design, and political history.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The final resting place of a German diplomat's beloved companion.

A statue of the original Pearly King is hidden in a church's crypt.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

Collection dedicated to brands, packaging and advertising.

London's smallest police station is barely the size of a phone booth.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

The largest of London's subterranean rivers and once a mad, bad center of London life.

A student driver's nightmare.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A kaleidoscopic warehouse-maze of handmade neon signs.