A castle built for love, and abandoned due to heartbreak.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

This Old Testament garden features 100 plants from biblical times.

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

The oldest farmer's market in America is so ancient it was approved by the King of England.

A fitting attraction for the corn capital of the world.

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

Despite repeated attempts to make it work, this former mining town is now nothing but dust and memories.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Granite outcropping that the state's tourism bureau doesn't promote because of its delicate ecosystem.

North America's oldest authentic African Village.

4,000 monkeys used for medical testing on an island off of South Carolina.

This psychedelic tromp l'oeil seems to be beckoning drivers to crash into a wall.

Oldest unrestored plantation house in America that is open to the public.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

The oldest bridge in South Carolina may have been designed by the same man who created the Washington Monument.

Amazing pre-Civil War ruins alongside a shallow, rocky river that hosts beautiful (but endangered) lilies.

One of the oldest living oak trees in the Southeast.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Abandoned Coast Artillery fort now serves as a graffiti canvas and sightseeing vantage point.