This geological gem is a must-see in Boonsboro. The Crystal Grottoes Caverns were founded in 1920 when the State Roads Commission was quarrying for limestone to build up and pave State Route 34. What they discovered astounded them and continues astounding visitors today – stalactites, stalagmites and many more natural formations.
Nearly 100 years later, the caverns are still a fascinating place to visit and learn. The only show cave in the state of Maryland, Crystal Grottoes says it is the most naturally kept cave in the world.