Natural sonic phenomenon comes with a grisly legend of murder and blood.

This bird-shaped rock formation defies gravity, time, and classification.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

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

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

The eroded core of an ancient volcano is now accessible by a short hike.

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

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

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

See massive fossils that are over 200 million years old in northeastern Arizona.

An off-the-beaten path cave with an underground lake.

A strenuous, unofficial trail leads to spectacular views in one of America's most remote national monuments.

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

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

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

The first permanent memorial to a unique secret weapon of World War II.

This comprehensive collection features Native American artifacts dating back centuries.

Run by members of the Tohono O'odham Nation, this community farm nurtures traditional desert cultivars.

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

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

Rippling sand dunes frozen in the Arizona rock.