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

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

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

Dramatic river bend surrounds a natural red-rocked pedestal.

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

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

Ancient pueblos built into the base of a natural canyon wall.

Limestone caves with spectacular showcase chambers.

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

One of the largest, oldest, darkest, quietest motel rooms in the world.

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

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

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

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

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

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

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

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

A Tucson museum and performance space full of found-object movable sculptures.

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

One of the world's largest telescopes, stares into the night sky with two huge mirrors.

A mysterious spirit totem at the edge of Navajo lands.

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

An artificial crater field that trained astronauts for lunar exploration.