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

Statue of death tucked in the University of Medicine courtyard.

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

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

A surrealist timepiece by the artist of melting clocks.

France's national museum of scientific and industrial instruments.

This museum houses an imposing skeleton army comprised of creatures great and small.

A museum of magic with a Sadist past.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

American soldiers discovered Europe's best one-liner at the end of World War II.

The shell of a medieval fortress offers commanding views of the area it once protected.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

Handsomely crafted representations of our round planet.

A breathtaking viewing platform over the Alps.

The house that took a plunge into the facade of a museum.

More than a millennium's worth of municipal records preserve the political history of Austria.

The medieval "dragon" on an Austrian city's coat-of-arms comes to life in a fountain.

Bizarrely-painted church designed by a controversial artist.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.