The remains of what was once the world's steepest passenger funicular.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.

This massive, Edo Period, coin-shaped sand painting is believed to be a source of great luck.

The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.

A hidden gem in the middle of the city's infamous Jewelry Quarter.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

This bike path was sunk below water level for maximum wonder.

The steepest classic funicular in the world glides along a dizzying incline.

These spooky and unusual stone formations create an underworldly landscape.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

A 22-million-year-old sandstone cave is a natural habitat for award-winning cheese.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

An abandoned football stadium with a tragic past.

Dubbed "Wistom" by locals, this abandoned factory is an urban explorer's dream.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

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

The world's largest wooden structure.

An eerie collection of the surviving structures from a past celebration of the future.

Arthur, Merlin, and Guinevere are among the largest and oldest satellite dishes on the planet.

These mysterious mazes carved on the rock may be up to 4,000 years old.

Perhaps the only prehistoric monument with its very own public bus stop.