Discovered after draining a local pond, these ancient man-made caves are still a complete mystery.

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

This little museum is built on a theater that was once a wildly elaborate speakeasy.

A beautiful geyser under environmental threat.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

A dilapidated dock tells the story of Titanic's missed arrival.

A hip bar decorated with walls of golden skulls.

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

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

A rare view of a preserved Victorian science museum.

Two thousand artifacts from around the world collected by one woman who loved to travel.

A museum befitting the city responsible for supplying the majority of the world's LSD.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

Its buzzing collection honors vibrator history.

This abandoned amusement park was built on a site with a dark history.

A trash dump made beautiful by nature's power.

Rainbow-hued local gem in Venice.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Mysterious rocks that ring musically when struck.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

An emporium for the weird, creepy, rare, and just plain gross.