These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

A quaint amusement park now sits, rusting and forgotten among the foliage.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

Once the most densely populated place in the world, this island is now a ghost town.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

A mysterious architectural gem in one of the most elegant areas of Buenos Aires.

A memorial to the victims of Argentina's "Dirty War."

Once swallowed by flood waters, this village has emerged as an eerie shadow of its former self.

An Argentinian businessman facing terminal cancer built this whimsical medieval village using salvaged materials.

Massive rock sculptures formed during the time of the dinosaurs still stand undisturbed.

This ancient burial cave along a roadside is also home to several Buddhist sculptures.

Xul Solar was an artist of alternate worlds, inventor of languages, and dreamer of utopias.

Stretching for 22 miles, the world's longest tree-lined avenue dates back to the early 17th-century.

This massive, beautifully-lit underground quarry leaves visitors in awe.

This World War II airfield enjoys a second life as a public park.

Natural time capsule containing an alien ecosystem.

This plaque tells the story of an event that took place in an imagined parallel universe.

Eerie ruins of an abandoned medieval fishing village crumble atop an unforgiving stretch of earth.

Icelandic folklore says this giant boulder was ripped from the mountains and placed at its current location, where it became home to elves.

This remote eatery and museum is preserved as a time capsule of a small Icelandic fishing town.

This rusting remnant of the local herring industry is being given a second life.