A natural swimming hole that was once a ceremonial center for Mayan priests.

A devastated ruin in the south of Belize where British explorers claimed to unearth the Mitchell-Hedges Crystal Skull.

Crumbling remnants of what was once a booming town full of silver.

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

More than 21,000 images fill this overlooked gem of a prehistoric site.

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

Wee (and not so wee) footprints that insects and reptiles of the Paleozoic Era left behind.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

A unique geological area spiked with wind-carved rocks that resemble teepees.

This is one really big nut.

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

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

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

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.