A popular swimming hole that hides one of America's most deadly diving spots.

A modernist landscape of water and sci-fi concrete.

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

Continuing the tradition of the dime museum in style.

Where hills of dirt conceal the burial ground of one of the most powerful ancient Native American societies.

Tucked away on an empty wooded lot in suburban Oklahoma City lie the remnants of an abandoned circus camp.

Collection of skeletal systems from the "world's leading supplier of osteological specimens."

An immersive art experience built by local arts collaborative, Factory Obscura, in the building formerly known as The Womb, a psychedelic arts center founded by the frontman of the Flaming Lips.

Topeka has its own great wall, and it's covered in colorful images from the city's history.

The quirky collection includes treasures like Elvis' underwear, Bob Barker's toothbrush, and hundreds of sock monkeys.

Home to Hollywood history and a very special salt crystal.

A unique attraction and museum dedicated to exploring iconic roadside structures.

The abandoned remnants of a little sanctuary for world peace that fell into disrepair.

Other-worldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

An experimental, automotive replica of Stonehenge.

The lowest point in South Dakota and the source of the Minnesota River.

This sculpture gallery is home to magnificent beasts made of scrap metal and found objects.

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

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

A roadside collection of over-sized iron creations that are a bit more macabre than most.

The world's largest Holstein cow.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

Native Americans built this circle of stones, which was used to predict astronomical events.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.