A luxurious doomsday bunker hidden beneath an unassuming Las Vegas home offers the best of subterranean suburbia.

Decades' worth of lost and forgotten objects make up the collection of this tantalizingly odd little museum.

An enormous illuminated figure dances on the Las Vegas strip.

An Arizona museum with a collection of pharmaceutical oddities, including a jar of a gangster's chewed gum.

This prehistoric karst cave is situated near a working ranch and historic warm springs.

Nature has shaped this drainage tunnel into the digestive tract of a mighty beast.

A small oasis not far from downtown Moab.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

Largest collection of mounted dinosaur specimens in the world.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

The world's last remaining store of its kind.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

This Italian dam is covered in salt-hungry goats who manage to scale its almost vertical face.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

This half-finished "city of toys" was almost Italy's own Las Vegas.

Italian cave with exceptional acoustics and an unsavory history.

Medieval torture techniques with a modern conscience.

One of the largest caves in the world open to the public.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."

The astonishing collection of an infamous criminologist.

Medieval town turned hippie commune, once home to the secret foreskin of Jesus Christ.

The graveyard is filled with beautiful funerary art and boasts breathtaking views of Florence.