These 90-year-old murals of local kings, Vikings, and outlaws hide in plain sight in a beautifully baroque shopping arcade.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

This famed Silk Road oasis was one of the largest cities in the world before it was destroyed by a Mongol horde.

A fiery crater has been burning in the Karakum Desert since 1971.

Museum dedicated to awful artwork.

An unsanctioned shrine that sprung up outside the late singer's home is causing a stir in London's Highgate neighborhood.

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

A comic book store that puts the marvel back in marvellous.

London's first edible insect farm offers facility tours and cooking classes.

This bewitching Babylonian goddess haunts a hallway of the British Museum.

One of the figures in this Celtic sculpture continues to puzzle archaeologists.

Colorful murals by Jean Cocteau hide within this peaceful London sanctuary.

The remains of the great moral philosopher reside in a university in London.

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

The photographs of "fairies" that fooled much of the world (including the creator of Sherlock Homes) were taken at this English stream.

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

Manchester salvaged this sculpture of the adopted Mancunian when it was no longer wanted in Ukraine.

A giant wooden soda bottle pays homage to a distinctly British drink on the very spot where it was invented.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

A 15th-century former coaching inn forms the implausibly grand entrance to a 1980s shopping mall.

When it came to designing his own small office building, the eccentric architect wasn't afraid to show the world what he could do.