The Edwards Aquifer, Austin’s main source of water, is fed by a variety of underground creeks filtered through a large layer of limestone. You’ll feel as though you’re entering one of this vast ecosystem’s sinkholes when you walk into this dimly lit enclosure—formerly the bathhouse at Barton Springs Pool—where a variety of interactive displays grab kids’ attention. Young visitors can make it rain on the city, identify water bugs, or peer through a periscope at swimmers. Splash! is part of the Beverly S. Sheffield Education Center, which has rotating exhibitions—perhaps one on the endangered Barton Springs salamander—and partners with the Austin Nature and Science Center on special educational programs.