This set of rickety spaceships are prepared to give alien travelers a place to relax and go to the bathroom.

This rare basilica nestled right in downtown Asheville is an architectural marvel, inside and out.

This North Carolina museum is keeping the pinball craze alive, with a little Space Invaders on the side.

Hidden amid the old-world charm of Savannah is a museum dedicated to the world of oddities and criminal history.

The first public building in Savannah to offer air conditioning was a luxurious cinema that still operates today.

A once-groundbreaking power plant turned into a hotel and mini-museum of archeological and geological wonders.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

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

The world's brightest bioluminescent bay.

This small primate research island is teeming with playing, fighting wild monkeys.

At this studio, musicians, engineers, and quite possibly a music-loving ghost carry on Puerto Rico's musical traditions.

The short hike is worth the stunning views and crystal blue waters of a secluded beach.

This sustainable, family-run farm just outside of San Juan makes for a dreamy daytrip.

An enchanting natural wonder in Puerto Rico's Camuy River Park.

A natural swimming pool in the middle of the Carite Forest.

The abandoned remains of this once-thriving hotel looms over the city, awaiting an uncertain future.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

A 300-ship graveyard, with a few still visible at low tide.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A huge musical instrument played by the ocean.