You want—no, need—a swimming hole ... by the arching remains of a limestone grotto, its ceiling sharp with stalactites. A waterfall spills into the pool, and the sound is so softly consistent ...

In Texas, Hamilton Pool Preserve is a swimmable grotto with a massive dome ... you'll spot a 45-foot waterfall that dumps into the swimming area. Use caution here, as the water can carry you ...

The new Yampah Mineral Baths includes five new swimming pools ... an infinity edge pool, a grotto-like pool with a waterfall, and another pool with a waterfall. Yampah Mineral Baths will be ...