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

Ruins of a Carnegie family mansion on Cumberland Island.

This foolish Victorian sea fort was converted to a deluxe hotel.

Remains of an abandoned coral city.

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

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

Inside this striking glass building, visitors can see thousands of dinosaur fossils in the positions that nature deposited them more than 150 million years ago.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

A grove of "candelabra redwoods" deep in California's Lost Coast.

Crooked windswept pines give this old forest an enchanted and magical look.

This enchanting natural park is a magical example of a temperate rainforest in Europe.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

The ruins of a resort and casino sit on the banks of this blue hole spring that pumps 70,000 gallons of warm, clear water every minute.

This reconstructed Norman castle is the world's most accurate, from location to livestock.

This picturesque abandoned home is rumored to be a spite house.

An abandoned fish-shaped drive-in gets a second life as a restaurant.

This temple contains what might be the world's oldest optical illusion.

These ruins have been linked to a sherbet factory that exploded, but the story may be entirely fictional.

Generations have refused to move this doll from its dusty resting place to preserve a castle from a watery fate.

This twisty section of highway in the Himalayan foothills is lined with thousands of small mirrors.

The national headquarters of the dowser’s society founded in 1961.

Designed to serve primarily the Maharaja, this is an interesting variation on the traditional stepped well.

The second-longest continuous wall on the planet protects a hidden secret in the deserts of India.

Twisted trees shaped by coastal winds make this woodland look like something from a spooky story.