Witness to many historic moments in early Texas history.

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

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

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

Turning night into day in Victorian-era Austin to thwart a serial killer.

Life's work of sculptor Elisabet Ney remains preserved in her last studio.

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