Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

A grove of colossal man-made flowers built to collect the sun's rays.

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

The only diamond mine in the world where you can keep what you find.

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

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

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

Where manatees are the snowbird vacationers in these balmy Florida springs.

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

A modernist landscape of water and sci-fi concrete.

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

A beautiful geyser under environmental threat.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Mysterious meeting place for UFO hunters near Area 51.

A memorial to the unknown and unheralded men and women of the Cold War military and intelligence services.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

An eatery for UFO seekers on the Extraterrestrial Highway.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

The drama of nature in full effect in this Nevada State Park.