Houston is a large metropolis in Texas, extending to Galveston Bay. It’s closely linked with the Space Center Houston, the coastal visitor center at NASA’s astronaut training and flight control complex. The city’s relatively compact Downtown includes the Theater District, home to the renowned Houston Grand Opera, and the Historic District, with 19th-century architecture and upscale restaurants. Houston is the most populous city in Texas and the fourth largest in the U.S., while San Antonio is second-most populous in the state and seventh largest in the U.S.

San Antonio is a major city in south-central Texas with a rich colonial heritage. The Alamo, an 18th-century Spanish mission preserved as a museum, marks an infamous 1836 battle for Texan independence from Mexico. Following the San Antonio River, the miles-long River Walk is a landmark pedestrian promenade lined with cafes and shops. HemisFair Park’s 750-ft. Tower of the Americas overlooks the city.

The caverns around San Antonio area feature several unique speleothems and other geological formations. The deepest part of the public tour is 180 feet below the surface, although undeveloped areas of the cavern reach depths of 230 feet. The caverns are still slowly developing. Due to the porosity of the limestone, rainwater travels downwards through the layers of rock, where it dissolves out calcite, a weak mineral that makes up all of the speleothems at Natural Bridge Caverns. After exiting the limestone, water enters the caverns where it flows and drips constantly throughout, causing the formations to retain a waxy luster that can be seen in few caverns.

Austin is the state capital of Texas, an inland city bordering the Hill Country region. Home to the University of Texas flagship campus, Austin is known for its eclectic live-music scene centered around country, blues, and rock. Its many parks and lakes are popular for hiking, biking, swimming, and boating.

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