This former Mormon settlement is reemerging from the receding waters of Lake Mead.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

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

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

This mysterious petroglyph evokes the ancient swastika symbol but was later vandalized with the more troublesome Nazi one.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

If astronomy had a ghost, it would look like this observatory.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

The remains of the dam that unleashed a 15-foot wall of water on Denver.

The largest island on the great salt lake is home to curious creatures and strange stories.

European castle ruins in an American state park are actually the product of death and grief.

This giant meditative chakra sits peacefully in the Flathead Valley of western Montana.

Home to the deepest rift anywhere on Earth.

Derelict buildings are all that remain of a complex at the site of one of the worst mining disasters in Montana history.

A miraculous natural phenomenon known as "the spring that breathes."

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

The ruins of this abandoned fort now stand as a picturesque reminder of America's march West.