Hellertown, United States of America
Lost River Caverns is a natural limestone cavern located on the east side of Hellertown, Pennsylvania, United States, and consisting of five chambers. The caverns were formed by the karstification or dissolving of the limestone by water. In the past the caverns have been called Rentzheimer's Cave an
d Lost Cave. The "Lost River", so named because the source and mouth of the river have not yet been discovered, flows through it. The temperature in the cave is consistently close to 52 °F (11 °C). There is a gift shop and a museum before the entrance. It was discovered in 1883 when a limestone quarry cut into it. It is open to the public.
Listen to the audio guide for Lost River Caverns Free on WIP — starts by itself when you arrive, even with the screen off