Many believe these images represent interstellar lifeforms.

A unique collection of drawings that represent Fremont Native American culture.

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

Named after an outlaw who used the basin as a hideout.

Thousands of glyphs created by an unknown culture decorate the rock formations of this canyon.

All of the 20 occupied houses in this mostly abandoned town feature some curious display of junk art.

A ghost town that held steady longer than most, but finally gave up the ghost.

Thousands of years ago, Indigenous people painted images onto these canyon walls that are still on display today, provocative, mysterious, and enduring reminders of the people who lived here long ago.

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

Archaeologists believe this panel of petroglyphs depicting descending sheep and other figures in Glen Canyon are 3,000 to 6,000 years old.

This remote desert watering hole has a connection to a curious chapter of American history.

A small canyon with petroglyphs and a seasonal waterfall, only a short hike from the remnants of old Route 66.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

Some 10,000 works of ancient rock art cover these volcanic basalt outcrops near the Gila River.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

The largest and most well-preserved petroglyph site in the Verde Valley.

Ute tour guides have been sharing the ancient dwellings and rock art inside this large park with visitors for more than 40 years.

A working cattle ranch with remarkably well-preserved prehistoric petroglyphs and ancient ruins.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

An outcropping plays host to the largest collection of pre-contact petroglyphs in Saskatchewan.

These petroglyphs created by ancient Arizonians have withstood centuries of exposure to the elements.

This set of mysterious petroglyphs in the Peruvian jungle could shed light on centuries-old activities in the region.