These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

The world-record holder for the longest bridge stretching continuously over water.

A little stop along the Texas highway where Rock Hudson, Elizabeth Taylor, and James Dean stayed while shooting the 1955 film "Giant."

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

This historic national park is covered in the stunning ruins of red rock pueblos.

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

An artificial crater field that trained astronauts for lunar exploration.

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

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

This gallery of prehistoric red ochre art lines the wall of a scenic segment in Utah's San Rafael Swell.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

Despite its name, this route in southern Utah offers a heavenly day trip.

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

A small oasis not far from downtown Moab.

Canyon walls shrouded in ferns.

Hike amid the palm trees that thrive among Southern California's Indio Hills.

This oasis-like spring in the Sonoran Desert is home to unique, endangered species.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

The biggest solar telescope in the world helps reveal the secrets of our sun.

Stairs often replace streets on the steep slopes of this old mining town.