Merrill Cave
The 111th longest cave in the world
0.2km · Length
Merrill Cave is a 650 foot (200 m) former ice cave in Lava Beds National Monument in California. It was known for the pool of ice that was found year-round in the lower chamber of the cave, which fully disappeared due to compounding factors by 2005.
Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).