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

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A 140-year-old castle with underground caves hidden in San Francisco.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A psychedelic labyrinth on the San Francisco bay.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A winding path built in secret on the edge of the continent.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Hot springs monkey spa in the middle of Hell's Valley.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Rippling sand dunes frozen in the Arizona rock.

These fantastically named natural pools look like something out of a Scottish myth.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Most-visited and most-photographed slot canyon in the American Southwest.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

At this California chicken ranch, four bucks will get you 18 eggs and a chorus of dancing animatronic poultry.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

A huge musical instrument played by the ocean.