One of the most accessible undersea plane wrecks in the world.

The world’s largest underwater sculpture is found just off the coast of Nassau.

This isthmus in the Bahamas narrowly separates the roiling Atlantic from the cool Bight of Eleuthera.

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

4,000 monkeys used for medical testing on an island off of South Carolina.

Morocco's Argania trees are infested with nut-hungry goats.

Cave where bat-eating snakes hang down from the ceiling.

In paradise, feral pigs have claimed an island all to themselves.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Renaissance villa and gardens complete with a tormented colossus.

On rare days, this abandoned castle's gatekeepers open its doors, revealing the eye-popping splendor hidden inside.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Aliens and monsters lurk inside this museum dedicated to one man's lifelong adoration of all things sci-fi.

A large collection of steam engines, organs, and fairground attractions.

A treasure trove of astronomical, mathematical, and scientific instruments at Cambridge University.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

This basement museum explores the art and artistry of fascism.

Small transmitter operated by a priest in the Netherlands.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

The tiny Belgian town's ancient version of Mardi Gras involves eerie wax masks, sticks for warding off evil, and ostrich plume hats.