Is there anything more magical and inviting than a misty, secluded hot spring on a cold winter day? The Western United States is teeming with natural hot springs just waiting for you to discover them.

The newest attraction at Yellowstone National Park is ice-blue, steaming hot, and about the size of a Jacuzzi. According to the U.S. Geological Survey, a new hot spring has appeared in Yellowstone.

For 50 years, the Roman Spa Hot Springs Resort in Calistoga has provided guests with hot springs, mud baths and rejuvenation, plus something else not every resort can offer — a family touch. “What’s ...