Three hundred years of preserved Spanish colonial history in San Antonio.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

On the side of a remote mountain, a stone face bearing an inscription of mysterious origin.

The biggest drug trafficking passage between Mexico and the U.S.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

Soldiers honored the beloved Pat with a special grave.

A pair of giant legs paying homage to a poem, a king, and it would seem, socks.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

A warm desert spring holds one of the rarest species on earth.

A recreated Stonehenge stands in a country field, complete with Easter Island moai heads standing as sentries.

A US military accident created the legends behind this Mexican version of the Bermuda Triangle.

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

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

The only museum dedicated to the history of the "Magic Lantern," a medieval slide projector.

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.

Remembering the Alamo with a full-scale replica of the 1836 city.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

The site of Billy the Kid’s most famous escape and the end to the Lincoln County War.

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

A gargantuan crystal kingdom.

The end of times arrives, at least for the fish in the O.C. Fisher Reservoir.

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

Natural catch-basin rocks covered in thousands of drawings spanning many millennia.

A cave's rare beauty held a cavernous secret hidden underground.