The Homestead Caldera, known locally as "The Crater", is a natural hot spring hidden inside a 55-foot tall, beehive-shaped limestone rock in Midway, Utah. Directly above the spring is a large natural opening, which was originally the only entrance to the crater. Those who wished to soak in the mineral-rich warm waters had to rappel through the hole at the top. It was only in 1996, that a tunnel was blasted through the base of the rock dome allowing visitors easy access.

Photo credit: homesteadresort.com