The secret wartime bunker built on the platforms of an abandoned Tube station.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

These morbid carvings remind churchgoers of the inevitability of death.

The townhouse where the English poet created some of his most influential work has been preserved in tribute.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

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

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

A Roman spa buried deep beneath the City of London.

This home on a quiet suburban street is completely covered with vibrant mosaics.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

Dictionary Johnson’s favorite feline.

The bar where "The Great Train Robbery" was planned was once a nexus of high society and low morals.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

English antique dealers with a taste for the unusual.

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

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

Repository for more than 22 million pickled specimens.

A mysterious artist-run cabinet of curiosities and library.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

This 1920s Dutch barge is now a floating bookstore.