An artist’s underground sanctuary, 40 years in the making.

This museum preserves the heyday of Puerto Rican coffee.

Puerto Rico's once thriving oil company is now an abandoned wonderland of rusty steel.

Everyone from Alan Ginsberg to The Rolling Stones has stopped by this classic dive bar.

On this Puerto Rican island, many abandoned naval ammunition bunkers sit open while a few have been padlocked by locals as personal storage.

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

Spanking machines, fake goats, and more devices of humiliation are on display in this museum of fraternal initiation devices.

This dramatic rail curve was once the target of a failed Nazi attack.

For those going through a life transition, a place to leave behind a piece of your former self.

Covered in tens of thousands of coats of paint, this Indiana attraction holds a world record all its own.

A forsaken wonder in the middle of the East Side neighborhood.

The most isolated mailbox in America lets desert travelers record their passing.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

This Cold War missile launch site has been abandoned for 40 years.

This Central New York ghost town was once a prosperous railroad community.

An abandoned Cold War missile radar site.

Incredible sculptures inspired by obscure passages from the Bible.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

The quirky collection includes treasures like Elvis' underwear, Bob Barker's toothbrush, and hundreds of sock monkeys.

Like stepping into a spooky fairy-tale, this shop carries the dark ideas of artists and other makers.

Thousands of unique minerals, including some of the most impressive fluorite crystals in the world.

The giant squid's 27-foot-long corpse lies preserved within a Sarasota aquarium.

The sun acts as a key that only fits this giant keyhole twice a year.

Admire the art and then buy a raccoon skull cleaned by flesh-eating beetles.