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

The cinder cone volcano with a less than complimentary name.

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

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

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

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

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

Home of the International Space Hall of Fame.

This is one really big nut.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

A museum dedicated to the alleged Roswell Incident.

When ecosystems collide in the arid Southwest.

A museum devoted entirely to the rattlesnakes and snake-related art.