A collection of massive stacked rocks in Texas includes a snarky note on the benefits of modern technology.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

A modernist landscape of water and sci-fi concrete.

An emerald-green grotto just a short trip from Austin.

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

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

Civil War dumping ground for the bodies of terrorized Union sympathizers.

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

Crumbling hotel echoes with the sounds of the '30s.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

An abandoned water sports stadium that has become a haven for graffiti and decay.