An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

A memorial dedicated to the victims of the Columbine High School shootings.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The highest bridge in America was built for an almost unnervingly small amount of money.

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

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

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The fifth-longest natural arch in the world, and the longest outside China.

Largest man-made excavation on earth!