When ecosystems collide in the arid Southwest.

The hallowed remains of a 900-year old Ancestral Pueblo great house.

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

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

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

Home of the International Space Hall of Fame.

This is one really big nut.

The remains of Abó, Gran Quivera, and Qurai are monuments to the long, complicated history of the Indigenous people of the Southwest.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

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

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A museum dedicated to the alleged Roswell Incident.

Hidden in the New Mexico desert southeast of Roswell, nine small deep lakes formed inside sinkholes.

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

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

This downtown Dallas art installation is always on the lookout.

The petroleum industry brings you the joys of hydrocarbons and largest collection of antique oil rigs in the world.