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

This titanic java kettle is one of the many kitschy landmarks located along America's OTHER famous highway.

If you want to take a peek at Area 51, this is legally as close as you're going to get.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

This relatively recently abandoned brewery is a tragic reminder of the continuing effects of Hurricane Katrina.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

In Florida, these naughty monkeys live on their own mini-monkey Alcatraz.

Secret gardens just a few miles from downtown Atlanta.

Once in a state of dilapidation, this candy-inspired fortress is now being revived.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

A secret, rocky playground hidden amongst the plain white beaches of the Florida coast.

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

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

The most isolated mailbox in America lets desert travelers record their passing.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

This abandoned lighthouse looks like a rusting oil rig, but has managed to survive a number of storms.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

Rummage through this sunken ship, but leave your scuba gear at home.

This lesser known Hearst estate is a fairytale village built from the stolen bones of historic European buildings.

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

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

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