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

Florida castle built with aluminum printing plates.

Former utopian colony based on the belief that the universe exists in a hollow sphere.

The smallest post office in the United States is no bigger than a broom closet.

In the depths of the Everglades, one man has dedicated his life to studying the elusive Skunk Ape.

Elvis's own personal tropical hideaway.

The history of the traveling carnival is remembered by this sprawling collection of vintage wagons, games, and rides.

The snowbirds here are circus sideshow performers.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

A luxuriant botanical garden below sea level.

This home is decked out like a psychedelic explosion of colors and bowling balls.

This small museum gives visitors a chance to soak up the history of the "sponge capital of the world."

Alabama has a fiberglass Stonehenge. With apologies to Spinal Tap, this one is full-size.

Come for the boats, stay to explore the intriguing assortment of art.

Founded by a man who called himself the greatest hunter alive.

A museum that houses the world's largest collection of ventriloquism dummies.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

America's post-nuclear-attack chambers of Congress.

An alternate history park where the Union Army loses the war... to dinosaurs.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

An overgrown collection of miniature buildings still stand as evidence of one couple's obsession with The King.

Forget Hollywood, one of the biggest stars in the world can be found in Roanoke, Virginia.

This collection of over 50 classic pinball machines awaits visitors to downtown Roanoke.