This Washington State Park Hides a 500-million-year-old Cave That's More Than 2,000 Feet Long

Inside the cave, you'll find rimstone pools and a 7.8-ton column that formed when a stalactite merged with a stalagmite.

Related Keywords

Canada ,Colorado ,United States ,Crawford State Park ,Washington , ,Crawford State Park Heritage Site ,Gardner Cave ,Pacific Northwest ,Discover Pass ,Earth Day ,