United States of America
Cave of the Bells is located in Sawmill Canyon on the eastern slopes of the Santa Rita Mountains of Santa Cruz County, Arizona. The cave contains a lake which is 80 meters below the entrance level. The lake has been measured at 76 °F (24 °C) and is believed to be warmed by sources below. Nearby Onyx
Cave is also of interest.
Listen to the audio guide for Cave of the Bells Free on WIP — starts by itself when you arrive, even with the screen off