A quiet memorial to those who died saving others in the heart of the City of London.

Public access to clean drinking water was an instant hit among the masses.

The taxidermied remains of a once-great parrot.

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

A cluttered and astounding collection of antiquities and curiosities.

A tongue-in-cheek arcade where the games are based on everyday life.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

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

The curios of pharmacist and collector Henry Wellcome.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

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

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

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

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

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

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

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

Surreal riveted sea forts once protected the Kent shores from German attack.

Grotto replete with mystical designs laid out in glued shell mosaics.

An intricately decorated tiny place of worship.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

This foolish Victorian sea fort was converted to a deluxe hotel.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.