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

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

The plague quarantine island home to the alleged "Vampire of Venice."

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

The hidden lair of an alchemist rediscovered in a 2002 flood.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This Buddhist temple is home to the graves of the Japanese national legends, the 47 Ronin.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

A Hungarian optometrist's charming collection of Asian art and curiosities.

Electrical curiosity museum housed in an old transformer station.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The most alien-looking place on Earth.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

An abandoned saucer-shaped monument in the Bulgarian mountains.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.