Eccentric concrete mansion and museum designed and built by hand from the inside out.

Less a museum than a bizarre fantasy world created by artists and engineers.

Toxic waste disaster that founded the Superfund program.

A natural gas leak provides a flickering flame beneath a waterfall.

Elevated freight railway turned wildly successful urban park.

America's largest man-made forest was planted in an effort to bring back the past.

This erect, phallic geological spire wasn't always named so domestically.

An experimental, automotive replica of Stonehenge.

Every president in history is immortalized in bronze in downtown Rapid City.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Mysterious rocks that ring musically when struck.

A toxic ghost town sitting atop a massive coal fire.

This "thrice-cursed" island is allegedly home to Captain Kidd's lost treasure.

A cemetery housing wild west legends in South Dakota.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

This replica stave church looks like a piece of Norway was simply plopped down in South Dakota.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

The world's largest military aircraft cemetery.