This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

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

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

A student driver's nightmare.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

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

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

A historic house left in "dramatic still life."

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

A mysterious artist-run cabinet of curiosities and library.

A cluttered and astounding collection of antiquities and curiosities.

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

Hear the quietest sound from across the dome.

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

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

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

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

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

One part local history, 99 parts gruesome haunted house.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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