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

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

A stealthy Apache hideaway that became the haunting site of a mass grave.

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

A self-built castle made by a mysterious man.

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

Rippling sand dunes frozen in the Arizona rock.

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.

An eatery for UFO seekers on the Extraterrestrial Highway.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

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

Graffiti, cars, and religion combine to create this jungle of scrap in the Nevada desert.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

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

Mysterious meeting place for UFO hunters near Area 51.

The smallest country in the world.

Many generations of travelers have passed through the steep, smooth walls of this canyon.

This dry lake bed contains the oldest known petroglyphs in North America.

Potential high level nuclear waste storage site for the next 10,000 years and beyond.

The contents of this safe survived a 37-kiloton nuclear bomb.

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

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

One of the most remote spots in America and the first protected wilderness area in Nevada, named after an old legend.