Crystal Cave

Crystal Cave is a limestone cave in Put-in-Bay, Ohio, with walls covered in celestine crystal formations that jut out several feet from the rock surface to create geometric patterns. These formations developed over thousands of years as mineral-rich water seeped through the stone and left behind deposits.

German immigrant Gustav Heineman discovered the cave in 1897 while digging a well for his winery. This discovery led to its development as a tourist destination for the area.

The cave became important to the local community during Prohibition, when the winery above it shifted to making grape juice and welcoming visitors.

Visitors descend about 40 feet underground to explore the crystal formations, making comfortable shoes and a light jacket recommended for the cool temperature below. Tours operate mainly during warmer months, so check the season before planning a visit.

The cave holds one of the largest known geode formations with celestine crystals, where pure crystals grow to impressive sizes. This unusual mineral wealth makes it a rare geological site in this region.

Location: Ohio

GPS coordinates: 41.64690,-82.82810

Latest update: December 6, 2025 16:02