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

Minimalist modern art on a repurposed military base in rural Texas.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

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

The only international border marker within the United States.

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

Once in disrepair, this popular Texas stop along iconic Route 66 has been restored to its past glory.

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

Over 100 million years ago, beach-bound dinosaurs left permanent marks on San Antonio's landscape.

This former Texas landfill is flush with 300 million-year-old fossils, all fit for the taking.

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

Twenty churches beautifully painted by 19th-century Czech and German immigrants in Texas.

Ruins of a once-opulent grand Victorian resort.

A medieval castle in the middle of rural Texas.

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

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

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

An abandoned quicksilver mining town surrounded by the Big Bend parks.

A Prada store in the West Texas desert that is never open for business.

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

The Grand Canyon of Texas.

Mysterious glowing orbs float through the desert night.

This mountain tram provides stunning views while hanging from a single, steel thread.

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