The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.

The first green space constructed on an elevated viaduct.

Cat art as far as the eye can see.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

This French chateau is home to the world’s largest private collection of fighter jets.

Largest illuminated advertisement sign in the world.

Kawaii meets poisonous at this unique art gallery.

It's bad manners to eat and drink on the subways of Tokyo, unless the train is this bar. 

This old Victorian bathhouse is fed by an ancient spring.

A century-old tradition has culminated in a small but singular collection of feline effigies.

An unusual round church in London with a Templar past.

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

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

The medley of artwork tells the history of this Scottish town.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

A serene public space nestled within the remains of Glasgow’s Victorian maternity hospital

Possibly the oldest of Britain's ancient henges is also one of its most stark.

A scattered trail of street art adds a pop of color to the city's stark structures.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.