The scuba diving training facility was named for the steam that rises from the cave's chimney.

This lush Florida island is home to the ruins of a crooked ship breaker's tiny empire.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A crumbling hospital from the 1850s on Roosevelt Island.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

Over 12,500 words are scrawled across each room of this historic plantation house and no one knows why.

Despite being made of a seashell mortar, the crumbling remains of this historic Florida mill are still standing.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

When this test site was abandoned, they didn't even bother to take the rocket with them.

Town of spiritualists and mediums in Florida.

An underwater city for the dead.

Human skulls and a stuffed goat made into a rocking chair can be found at this strange little store.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

A luxuriant botanical garden below sea level.