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

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

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

The world's largest rose bush has literally outgrown the pioneer museum it was planted behind.

This golf ball–shaped former desert real estate office now houses a UFO museum.

Limestone caves with spectacular showcase chambers.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

A spiritual vortex among the red rocks in Sedona.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

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

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

Founded by members of the Tohono O’odham Nation, this one-room joint's James Beard–winning fry bread is light as a cloud.

The fading, forgotten remains of a once bright and booming factory.

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

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.

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

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

A reproduction of earth's many biomes.

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."

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

Dramatic river bend surrounds a natural red-rocked pedestal.

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