Glenwood boasts the world’s largest natural hot spring.
Glenwood Hot Springsœ Resort
The world’s largest hot springs pool may not be as glamorous as a few other options on the list, but it’s just as relaxing. Not to mention: The naturally heated water is chock-full of 15 different minerals, including calcium, magnesium, zinc, and silica, to name a few, that do everything from relieving muscle aches to eliminating toxins and increasing circulation. In other words, the Glenwood Hot Springs Resort is like a trip to a holistic doctor’s office—in the best way.