This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

The topiary maze at the Habsburg hunting lodge.

Series of storm drains connected to a dark urban legend.

This massive subterranean fissure is known as the "underground Grand Canyon."

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

A beautiful maze marks where three countries meet.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

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

An optical illusion found amid a logged redwood forest.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

Mexican food and folk art.

A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

The largest stone moai on Rapa Nui.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

Arlington Cemetery exhibit dedicated to death and grieving.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.