Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

One man's vast collection of artifacts and ephemera from matchbooks and postcards to vintage neon signs and cars.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

A library of rare occult books in Los Angeles.

A hospital closed seemingly in the middle of operations, leaving behind fodder for horror films and ghost hunters.

A hand-built folk art installation covered with messages of God's love.

Shop selling 500 flavors of soda has something for everyone.

World's largest collection of serial killer artwork and other macabre exhibits.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A psychedelic labyrinth on the San Francisco bay.

Roadside tribute to a staple of eastern European cuisine.

The frozen bubbles that form on the icy surface of this Canadian lake contain enough methane to create a small explosion.

Sitting empty in a lonely Canadian field is a century-old stone bunker sometimes called "One Man's Castle."

What was to be the world's most secure Cold War document vault ended up as just a few shallow caves.

One of the last remnants of the city's Chinese nightclub scene is now a dive bar selling killer mai tais.

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

Disused penal colony features prisoner artwork, some sketched in human blood.

This former luxury resort in Kaua'i is now an abandoned relic.

An abandoned logging settlement nestled in the woods near a popular ski town.

Beautiful mostly-abandoned town only accessible by sea-worthy boat or plane.

The ruins of a rehabilitation center for World War II vets can be found in the Westminster Ponds Conservation area.

A small and quirky museum hidden inside a fence.

An abandoned amusement park hints at the twisted history of the Newfoundland Railway.

A long-abandoned provincial prison left to crumble in the frigid air of Ontario.