Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

One of the largest, oldest, darkest, quietest motel rooms in the world.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

Dramatic river bend surrounds a natural red-rocked pedestal.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Most-visited and most-photographed slot canyon in the American Southwest.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

The cinder cone volcano with a less than complimentary name.

Over 600 vacuum cleaners stack the shelves of what may be the cleanest museum in America.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

Limestone caves with spectacular showcase chambers.

America's only nuclear missile silo open to the public.

A reproduction of earth's many biomes.

This Route 66 classic sports a giant fiberglass rabbit that you can ride.

A mysterious "wedding cake" castle in the middle of the urban desert.

A museum and tribute to a brave profession.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

Rippling sand dunes frozen in the Arizona rock.