A relic of Victorian grandeur hides beneath a busy South London road.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

A Roman spa buried deep beneath the City of London.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

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

This coffee shop lies hidden beneath a historic church.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

Abstract dinosaur models in London.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Scattered throughout London are ancient remnants of the city's former bounding wall.

The television series' iconic giant foot was borrowed from this classical painting.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

A network of concealed passageways lies within a busy London Underground station.

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

The remains of Crystal Palace Great Exhibition of 1851.

The final resting place to 300 Victorian-era pets hides inside the city park.

Rebuilt remains of a temple to Roman god Mithras.

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

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

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

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

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

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