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

The biggest solar telescope in the world helps reveal the secrets of our sun.

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

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

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

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

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

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

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

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

The world's largest military aircraft cemetery.

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.

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

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

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.

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

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

A reproduction of earth's many biomes.

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.

Dramatic river bend surrounds a natural red-rocked pedestal.