Homestead Crater, Utah, USA This 10,000-year-old geothermal crater at the Homestead Resort in Midway, Utah, is known for its beehive-like shape and naturally heated waters. Visitors can even scuba dive, snorkel, enjoy paddleboard yoga, or soak in the crystal-clear pool. Visitors are required to make a reservation beforehand but for a cheap fee of around £13. Image Source: Courtesy of Homestead Resort