A whimsical bridge adorned with decorative dragons.

This abandoned Slovenian military barracks has become a punky-political art squat.

This one-time health resort was used by aristocrats around the world.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

The fairy tale castle of the "fairy-tale king."

Before the electric telegraph, a chain of stone towers carried messages across France.

This unusual piece of Renaissance art depicting the bodily horror of crucifixion and skin disease may have been inspired by fungus-induced hallucinations.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

France's high-tech, future-themed amusement park.

France's Lilliputian park displays over 100 of the country's monuments for visitor perusal.

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

An ancient monastery, a locked room, and a mysterious book heist.

Hundreds of hidden passageways weave through the old quarters of Lyon.

This demon atop the Notre-Dame de Paris looks utterly bored.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

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

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

There has been an astronomical clock on this spot since the 14th century.