The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

This 700-year-old street food market features baby octopus and soy donuts.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

A lush green oasis in the middle of Chicago.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

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

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

Experience park where visitors are told to expect the unexpected.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

Where manatees are the snowbird vacationers in these balmy Florida springs.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

The magical, mossy forest that inspired Princess Mononoke.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

A self-built castle made by a mysterious man.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

A technicolor place of worship for Elevationists.

Take a drunken tour inside the world's largest known geode.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

Northern Ireland's Brobdingnagian stepping stones.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

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

A hotel and restaurant serving as the mecca of kitsch.