Barton Springs.

Barton Springs Pool in Austin’s Zilker Park is a unique natural oasis featuring spring-fed waters that stay a refreshing 68-70°F year-round. This historic pool, dating back over 10,000 years, is a vital habitat for endangered species like the Barton Springs salamander and has been a beloved local retreat since its 1920s public opening. The pool is also significant culturally; it was a sacred site for the Tonkawa Native Americans. Besides swimming, visitors can enjoy grassy areas for picnics and sunbathing, and participate in community events, including the popular monthly Full Moon Party. With its picturesque setting, commitment to conservation, and rich traditions, Barton Springs Pool is a true reflection of Austin's vibrant spirit.