This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Less a museum than a bizarre fantasy world created by artists and engineers.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

The world's longest known cave system.

A Hawaiian stairway to heaven—that you can't climb.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

A psychedelic labyrinth on the San Francisco bay.

A rare view of a preserved Victorian science museum.

Ruins of a German Castle on top of a towering stone pillar.

Hollowed out cedar log tubs set in an ancient towering forest.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Continuing the tradition of the dime museum in style.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Enormous lake at the bottom of a unique cave system.

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

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Macabre astrological automaton clock dating to the late 1400s.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Dramatic river bend surrounds a natural red-rocked pedestal.

A bizarre house filled with an astounding array of collections.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.