A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.

A cheeky architectural easter egg.

Mummified monks and the accidentally interred, in a 17th-century crypt.

Europe's second largest ossuary wasn't discovered until 2001.

Shimmering sea-colored mosaics and Jesus statues cover this opulent building.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

Ride a dragon train into a world of dwarves.

Historic medieval fortified city in southwest France.

Spain's largest bullring offers a unique glimpse at architecture and history.

The world's largest wooden structure.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

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

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

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

Notorious artist squat renovated into legal studios.

Devilish masks, handicrafts, and pieces of old buildings create a snapshot of life in a historic Alpine region.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

Visitors dip into a variety of pools of what was once ice.

Atop the former site of a historic bakery sit two stone tributes to Verona's contribution to traditional Italian baking.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

These elaborate gothic monuments honor Verona's medieval lords.

Walk inside a half mile long crevice right outside the town of Garmisch Partenkirchen.

This beautiful 19th-century temple stands atop the ruins of its predecessor.