Site of a former hidden treehouse in New Orleans.

A cave's rare beauty held a cavernous secret hidden underground.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The only museum dedicated to the history of the "Magic Lantern," a medieval slide projector.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

A Prada store in the West Texas desert that is never open for business.

What is the Thing?

The Magical World of George Phar Legler.

Beer lover's can-covered house.

Fantastic collection celebrating the final send-off.

Destroyed by flood waters, prison now serves as a training ground for armed forces.

The once abandoned ruins of a Victorian beachside amusement park are now back in working order.

This amazingly preserved Gold Rush town is a historian's dream.

Odd outsider art installations surround a Gold Rush-era ghost town.

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

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

A typical "Old South" manor, once owned by author Anne Rice, served as the setting for several of her witchcraft sagas.

Abandoned hotel with adjacent lake and golf course.

A mining town once rife with murderous disputes over its copious treasures now creates income as a popular spot for photo shoots.

The ghost town that ended up on Ebay.

Version of the French Riviera destroyed by the sea.

The memorial to the victims of the Jonestown Massacre carries the names of 918 lost, including one name people wish wasn't there.

An emerald-green grotto just a short trip from Austin.