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

The Magical World of George Phar Legler.

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

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

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

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

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

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.

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

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

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.

Rippling sand dunes frozen in the Arizona rock.

Abandoned former poorhouse, bible college, and haunted house in an Ohio hamlet.

A suspended garden, now gone, once hung in the middle of this abandoned church.

At the center of this cemetery stands a 2,000-year-old burial mound of the Adena culture.

A rare particle accelerator with a tremendous energy range is tucked away at Ohio University.

This schoolhouse for Black American children is one of the oldest remaining in southeastern Ohio.

For decades, this waterfall remained hidden because of an artificial dam.

An elegant sandstone stairway built by the WPA still connects two neighborhoods in Akron.