Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

The world's oldest known salt mine.

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

Ride a dragon train into a world of dwarves.

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

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

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

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

A spherical "micro-nation" in the heart of Vienna.

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

A collection of collections, including an anatomy museum, the “Cabinet of Physics of Alessandro Volta, a museum of natural history, mineral collection, and much much more...

The abandoned ruins of a failed resort hide on this verdant, picture-perfect island.

A line of abandoned, alien-like fortresses dot the mountains of North Italy.

Geometry and mystery come together in an epic show of octagonal masonry.

A once-luxurious, now abandoned hotel in the Italian Alps.

A lover's walk between hilltop towns, decorated with graffiti love notes.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

This museum is rotten with a century of wax medical deformities.

Crushed coral and crystals give the sand its signature coloration.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.