The ruins of a cotton mill that was burned in the Civil War are still hidden in a Georgia forest.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

Ruins of a Carnegie family mansion on Cumberland Island.

Bad farming practices caused this unnatural natural wonder.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

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

A bizarre roadside attraction and the first instance of miniature golf in the world.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

A 1960s damming project turned one family’s hilltop cemetery into an island.

Once luxurious, these oceanfront beach homes have been left to succumb to the elements as the beach is slowly washed away.

A replica of where the Last Supper was held.

The highest point in South Carolina was once owned by an energy company that neglected it but now the state is taking it back.

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

This recently rediscovered Civil War-era submarine was the first to ever sink an enemy ship.

The remains of a chapel created for convenience.

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

Settled in 1696, abandoned after the Revolutionary War.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

An unfinished rail tunnel that has since been used to house cheese and bats.

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

Despite being burnt down multiple times, the ruins of this South Carolina church are still standing.

According to local lore, this narrow passageway through two large rocks was accidentally created by the devil himself.