21.  The Homestead Crater, Utah

Image courtesy of thaigoodview.com

Located in the city of Midway, this popular geothermal spring is deep within the unique dome-shaped limestone rock. The water is a beautiful blue and bath-like with a temperature of 95 degrees Fahrenheit. Visitors can go scuba diving, snorkeling, swimming, or simply relax and enjoy. There’s no marine life here but divers love diving 45 feet down without wearing a wetsuit.

22.  Wind Cave National Park, South Dakota

 

The Wind Cave is underneath the grasslands. It’s the longest network of caves in the world. Its name is apropos as mighty winds blow in and out of the mouth of the cavern and some of the rock formations here are over 310 million years old. Be sure to see the popular box-work where the calcite has created interesting intricate honeycomb patterns. 

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