The trials and tribulations of marking Poe's grave.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

This airfield is home to a number of retired vintage planes in various states of disrepair.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

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

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Settled in 1696, abandoned after the Revolutionary War.

If astronomy had a ghost, it would look like this observatory.

Unique tower has outlasted a takeover of the company.

Beneath the surface, something slithers. And if you find it, prepare to be slimed and glowing.

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

Jule Körner's house full of bizarre architectural details.

A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

North Carolina's finest examples of Native American pictographs have survived for 5,000 years.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

The uniquely-designed winter home and sculpture studio of Anna and Archer Huntington.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

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

Ruins of an American Civil War iron forge still survive today.

A hobby born from insomnia has turned into a hangar full of objects that have been be-buttoned by the Button King.

The only free-standing, vertical sundial in the US was keeping standard time before it was even invented.

This natural spring not only claims to heal the wounded but it has also been willed to God.

The world's largest fire hydrant is supposedly tornado-proof.