An artificial crater field that trained astronauts for lunar exploration.

The closest thing to Mars on Earth.

An eatery for UFO seekers on the Extraterrestrial Highway.

The farthest you can be in the contiguous U.S. from a McDonald's location.

The site of an underground detonation of a megaton nuclear bomb in the middle of the Mojave Desert.

This massive crater in the middle of nowhere was used to train astronauts for moon landings.

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

This massive geographical sculpture is so subtle, it's possible to pass by it without noticing.

Nearly 300,000 acres of wildlife, natural splendor, and a hidden ghost town have been designated a national monument.

Preserving the remains of Native American cultures which otherwise would have been submerged behind Hoover Dam.

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

Named after a bandit and the star of several Hollywood prehistoric landscapes, these sandstone formations are a historical part of the Los Angeles natural landscape.

One of the only places where Earth’s mantle lies above water.

Named after the Goddess of Harvests, Annapurna is the deadliest member of the Eight-thousanders club.

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

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

A beautiful geyser under environmental threat.

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

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

These otherworldly limestone formations jut out from the Kansas prairie.

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.