Notorious artist squat renovated into legal studios.

This massive library holds what was once the largest book collection in the world.

Founded as a refugee camp, now a popular tourist spot.

This plaza at the end of the world teems with monumental tributes to a problematic history, and laser discs.

This Parisian gem is one of the most incredible ethnographic museums in the world.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

Abandoned railway line circling the city of Paris.

France's most famous cemetery, with some of its most curious tombs.

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

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

A cluttered and astounding collection of antiquities and curiosities.

Rebuilt remains of a temple to Roman god Mithras.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.