The world's largest military aircraft cemetery.

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

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

Limestone caves with spectacular showcase chambers.

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

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

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

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

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.

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

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

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

An homage to everyone's favorite prehistoric cartoon family.

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

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

A reproduction of earth's many biomes.

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

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

A self-built castle made by a mysterious man.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

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.