The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

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

An architect's childhood fantasy treehouse made real.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

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

A world-class observatory in the California desert.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The longest continuous lava tube in Oregon.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

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

A house carved into a rock in the 1940s.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Legends surround this jagged rock formation in the New Mexico desert.

A former utopian healing center created by a huckster and built by derelicts.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

One of the ghostly stops along Route 66.

A wall of chewing gum moonlights as collective art.

See massive fossils that are over 200 million years old in northeastern Arizona.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

The ghost town that ended up on Ebay.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A museum dedicated to the history and exploration of both popular music and science fiction.

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