The commemorative stone column conceals a secret laboratory.

London's old-school healing garden.

An incarceration museum on the spot of possibly the oldest prison in England.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

This open-air mosaic gallery honoring an English artist took hundreds of volunteers more than seven years to create.

Hear the quietest sound from across the dome.

A hands-off space for graffiti artists to hone and display their skills.

Eighty million natural history specimens call this gargantuan museum home.

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

One part local history, 99 parts gruesome haunted house.

The bronze uniforms commemorate the vital role of women during World War II.

This ancient Egyptian obelisk still bears the wounds of World War I.

The anatomical-pathological collection of a man who changed surgery.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

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

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

This coffee shop lies hidden beneath a historic church.

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

A quartet of tiled art pieces adorn the floors of this prestigious art museum.

A cluttered and astounding collection of antiquities and curiosities.

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

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

The remains of the great moral philosopher reside in a university in London.