Cosmic Cavern

Cosmic Cavern is a limestone cave located in north Arkansas, near the town of Berryville, Arkansas. One brochure for the cave touts it as "Arkansas' Most Beautifully Decorated Cave." It is the "warmest" cave in the Ozarks, having a high humidity holding at a constant 64 °F year-round. Most caves in the area are between 55° and 60°. The cave has an abundance of formations (speleothems), including stalactites, stalagmites, flowstone, cave popcorn, cave bacon, and a multitude of soda straws and helictites. One section of the cave housing a particularly enormous group of soda straws has been dubbed "Silent Splendor." One of the longest soda straw formations in the Ozarks, this large formation has straws hanging up to nine feet in length.

Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).