Join the long history of people relaxing in warm mineral waters by visiting a hot spring. You can find naturally occurring hot springs through the United States, but they’re most plentiful in West Coast states. These fascinating spots are also known as thermal springs. They form when geothermal heat (heat from within the Earth) warms groundwater. Some springs can reach wickedly high temperatures that repel all but the most heat-resistant organisms. Lucky for water-loving travelers, there are also plenty of comfortably warm springs to enjoy throughout the country.
Find your next hot spring experience with this list of six free hot springs destinations. Or, have a more luxurious vacation at these hot spring resorts.