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

This overlooked street light once served as a KGB dead letter box.

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

Tucked away behind the mansions of Mayfair, this picturesque garden is a hidden London treasure with a spooky past.

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

This tribute to the fictional detective stands at the famous literary character's address.

A plaque marks the underground site of one of London's "lost rivers."

This London marker celebrates the spot where the world-famous English band was founded.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

This 19th-century pub features stained-glass windows celebrating Victorian-era “champions.”

On October 17, 1814, a 15-ft. wave of beer ran rampant through the streets of London.

This is London's smallest listed building.

This inn of the court provides a fascinating window into London’s legal and architectural history.

Behind one of the world's most impenetrable vaults is a massive collection of retail silver.

This pub has roots dating back to 1430 and serves as the setting for multiple Charles Dickens stories.

London’s first road overpass is so old that it was originally built for horse-drawn carriages.

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

On the eve of a condemned prisoner's death, this bell rang 12 times outside their cell.

Named after a lodging site that existed nearby, a bridge has existed at this location since 1455.

This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

A treasure trove of astronomical, mathematical, and scientific instruments at Cambridge University.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.