The rocks in this arid basin leave trails of movement behind them.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A terrific purveyor of natural history objects and curios.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A bizarre roadside attraction and the first instance of miniature golf in the world.

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

A battle between nature and architecture in the Cambodian jungle.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

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

A church of bones, decorated with 40,000 human skeletons.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

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

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

The world's longest known cave system.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

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

Eighty million natural history specimens call this gargantuan museum home.

A beautiful geyser under environmental threat.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

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

The first declared National Monument in the United States.