One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

An octet of classic chrome trailers speared into the ground act as a tribute to the silver bullets of the open road.

A mega theme park-wax museum mélange containing all things biblical.

The collection of 80+ pieces created between the years 1100 and 1500 is intended to be seen, heard, smelled, touched, and tasted.

Gutted airplanes slowly decay in a Florida field.

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

The only runway directly into the magic kingdom has been closed since 1972, but it still sings to you if you drive fast enough.

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

This facility, now a museum, once housed and trained U.S. Army Air Force pilots who flew during the Allied invasion of Normandy.

This sidewalk monument honors more than 50 civil rights activists who helped change the face of America.

A unique collection of diving equipment spanning antiquity to the present day.

This railroad and oil tycoon's lavish estate now stands as a time capsule of the Gilded Age.

The museum chronicling a treasure hunter's dream, fulfilled.

A graveyard of bathyspheres and diving bells paints a weirdly accurate account of ocean exploration's rickety history.

Wading through a small lagoon reveals a secret, wild stretch of pristine beach.

With nickel-steel armor and three-inch thick bullet resistant windows, FDR's train was a rolling fortress.

The futuristic test model of an iconoclastic visionary who wanted to redesign the world.

This now-deactivated naval base defended the Florida coast for centuries.

The unique collection includes bronze cast handprints of some of America's most famous astronauts.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

The third tallest lighthouse in America once guided author Stephen Crane to safety.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

A building so large that it has its own weather.