This small museum dedicated to the painful memory of segregation is essentially a time capsule.

An abandoned asylum incorporated into a college campus.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

The oddly shaped, steam-spewing building is now an art studio and gallery.

A "hospital" where people went to be quarantined, die, and be buried in the yard.

A castle built by an eccentric medieval enthusiast in rural Ohio.

Now in disrepair, this 19th century station was a stop on of the famed B&O Railroad.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

This woodland architectural installation acts as a camera obscura for the heavens.

A suspended garden, now gone, once hung in the middle of this abandoned church.

Rotting dome home spotted near Chapel Hill, North Carolina.

The world's largest vertical wind tunnel.

This abandoned school has had many lives since the early 1900s, and all of them doomed.

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

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

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

This 19th century mansion façade adorned with immigrant patriotism is a symbol of Louisville’s history.

The language and heritage of a nearly forgotten culture can still be explored in this Southern enclave.

The remains of a chapel created for convenience.

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

The "last unrestored grand mansion of Savannah" is now a cramped, mouldering maze of antiques.

This quirky curiosity shop takes its cues from the world's bazaars.

This ceremonial mound is one of the first officially recognized Native American historical sites in North Carolina.

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