The graffitied ruins stand hidden within the Pennsylvania woods.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

An abandoned stretch of highway, deteriorating next to the operational one.

A toxic ghost town sitting atop a massive coal fire.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

World's first "penitentiary," meant to be humane, drove men insane.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Once the most flame resistant building in the country, the South Carolina Historical Society building was almost burnt down in a fire.

This South Carolina water tower is an icon of the city of Walterboro, but it also once served as the county jail.

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.