Hamilton Pool Preserve

20 Best Swimming Holes in the U.S.

"A swimmable grotto in Travis County, Texas, offering the rare experience of bathing inside a massive rock amphitheater formed when the roof of a cavern partially collapsed thousands of years ago. The exposed dome creates a natural roof over the swimming hole and a lush grotto atmosphere, but authorities warn visitors not to get too close because of the risk of rockfall; it is less than an hour's drive from Austin." - Talia Avakian Talia Avakian Talia Avakian is a lifestyle reporter based in Los Angeles with a love for outdoor excursions, off-the-beaten-path local finds, remote and historic hotels, and innovations in food. She was previously the digital news reporter for Travel + Leisure. Travel + Leisure Editorial Guidelines