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

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A geological mystery on Camelback Mountain.

When ecosystems collide in the arid Southwest.

A multi-storied adobe complex has been inhabited for more than a thousand years.

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

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

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

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

A tiny piece of the Moon is embedded in this stained glass masterpiece.

This grand gothic brewery has been pumping out suds for over a hundred years.