This striking public art installation is suspended above a public park, designed to gently move in the breeze.

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

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

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

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

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

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

Limestone caves with spectacular showcase chambers.

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

A spiritual vortex among the red rocks in Sedona.

An urban laboratory.

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

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

A reproduction of earth's many biomes.

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

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

Dramatic river bend surrounds a natural red-rocked pedestal.

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

The site of the climactic scene from the classic horror film is now a historic landmark.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

A tiny piece of the Moon is embedded in this stained glass masterpiece.