The ruins of an abandoned 18th-century town that is slowly being reclaimed by the forest.

Ever wanted to can Spam?

The site of the Wellington avalanche, one of the America's worst railroad disasters.

A famed data visualizer's personal sculpture garden is a landscape of modern and megalithic wonders.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

This beautiful grotto is one of those places where you can't believe you're just outside Austin.

Civil War dumping ground for the bodies of terrorized Union sympathizers.

Beautiful waterfalls grace a canyon visibly torn by a violent tornado.

Alabama has a fiberglass Stonehenge. With apologies to Spinal Tap, this one is full-size.

Giant granite rocks standing end-to-end like a train of circus elephants.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

Unknown to many, this sparkling turquoise lake hides amid Oregon's snowcapped mountains.

The remains of a 12th-century chapter house in Golden Gate Park.

The small cave that housed Tennessee's "first citizen."

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

A peaceful, unique botanical garden complete with waterfalls, mini islands, and swans.

The city of Rockford, Illinois is symbolically protected by a quartet of fittingly stony sentinels.

The world's largest rotating world.

The fifth-longest natural arch in the world, and the longest outside China.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

Trace the history of writing at this unusual North Carolina destination.

A spring-fed pool so deep it's used for scuba diving as well as swimming.