This massive underground salt mine now holds a sci-fi theme park in its depths.

A small town Romanian cemetery filled with darkly humorous gravestones.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

An ethereal glowing blue ocean cave in Croatia.

Be(w)ar(e) the moat around this historic Czech castle.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

Fighting the British and making game shows for over 150 years.

An abandoned desert hamlet swallowed up by sand.

An ornate Thai pavilion in the middle of Sweden.

One man's fascination with Turkey led to this backyard mini-city.

A golden egg-shaped sauna in the Arctic tundra.

Rising from the sea like a stone monster.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Two well-hidden huts let animal lovers spend the night among the bears, wolves, and other predators of the forest.

Rusted cars, trucks, and buses form a fascinating collection of Soviet-era machinery.

A narrow strip of land is home to the tallest migrating dunes in Europe.

These abandoned vessels are destined to be reclaimed by the forest.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

An abandoned outdoor movie theater in the Sinai desert.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

These warring psychedelic crags commemorate an unsuccessful military operation.

The legendary birthplace of the Japanese maneki-neko is dotted with hundreds of lucky beckoning cats.

If Hello Kitty were Mickey Mouse, this would be Disneyland.