Not many natural pools can boast their own waterfalls ... the Barton Springs Pool in Austin, Texas, covers three acres and maintains a temperature of about 68 degrees year-round.

Keep in mind, however, the pool closes each Thursday from 9 a.m. to 7 p.m. If you visit from the school district's spring break (Austin Independent School District) through the end of October ...

Nestled in a corner of Zilker Park, the Austin Nature & Science Center ... cool down with a dip in Barton Springs Pool, a 3-acre natural swimming hole. A theater, train for children and sports ...