Each year melting snow turns these Austrian hiking trails into scuba zones.

Artfully arranged bones of 5,800 Austrians.

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

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

The final resting place for the remains of 143 Habsburg royalty.

This 17th-century passageway is home to numerous bookshops, a witch legend, and the oldest pizzeria in the world.

The relics of dozens of martyrs are stored in a single chapel.

The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

This uncanny fresco celebrating the "triumph of death" was split into four pieces to be moved to another museum.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

Every inch of this chapel is covered in craftsmanship from across the world.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

Thousands of well-dressed mummies below a monastery.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

A mud statue stands in the dark tunnels, seeming to hold up the weight of the city above.

This 11th-century Greek monastery has renowned mosaics and relics of a brutal past.

This restaurant is proud to be built atop a burial ground.

An intricate network of underground tombs carved into volcanic rock.

This secluded museum beats the drum for the preservation of Nepal's musical heritage.