One of the best places to see feral Colonial Spanish Mustangs in the United States.

North Carolina's finest examples of Native American pictographs have survived for 5,000 years.

A historic covered bridge, only one of two remaining in North Carolina.

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

A piece of outsider public art accompanied by a strange urban legend.

This bright yellow relic is the final survivor of a short burst of seashell-shaped petrol pumps.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

This bridge is haunted by the ghost of a distraught mother.

A sculptor's dream castle turned fantastical ruin.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

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

These eerie outliers of the lightning bug family glow a mysterious blue color.

More than 300 years ago, a revolt at this Hopi pueblo shaped the future of the American Southwest.

This reclusive Hopi village in Arizona has been continuously populated longer than anywhere else in America.

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

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

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

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

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

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

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Rippling sand dunes frozen in the Arizona rock.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.