Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

This little-known relic crypt holds stolen parts of a Roman Empress.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

A subterranean shelter remains intact under a busy Paris railway station.

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

Indents in the pavement are all that remain from a grisly death machine in Paris.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

Abandoned railway line circling the city of Paris.

One of the most poignant ruins of the Chernobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

This attraction was abandoned after the Chernobyl disaster.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.