Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A massive underwater sinkhole made famous by Jacques Cousteau.

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

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

A fiery crater has been burning in the Karakum Desert since 1971.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A beautiful geyser under environmental threat.

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

Home of an evil witch famous within southern folklore.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

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

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

A submerged archeological park still holds the wonders of a Roman Sodom.

The atmospheric road was never meant to be so creepy.

Enormous lake at the bottom of a unique cave system.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

An Australian lake whose pink hue defies scientific explanation.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

A toxic ghost town sitting atop a massive coal fire.