Hidden in London

This statue of one of the engineers who created the London Underground hides a ventilation shaft for the tube lines that run under the street.

A mysterious suspended hand greets unsuspecting visitors at the Tower of London.

The commemorative stone column conceals a secret laboratory.

An architectural oddity hides in plain sight on this iconic London bridge.

William Smith's iconic "map that changed the world" is hidden behind a curtain in the Geological Society building.

Buried for centuries, this hidden cellar is all that remains of London's medieval Whitefriars Monastery.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

This overlooked street light once served as a KGB dead letter box.

This hidden green space is the city's second largest conservatory.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

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

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

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

Hidden beneath the streets of London is a secret subway that only carried mail.