3. Hocking Hills State Park, Hocking County
Known for its stunning natural beauty, Hocking Hills State Park in southeastern Ohio is also a hidden gem for rockhounding. The park's unique rock formations, such as Blackhand sandstone and Ohio Shale, hold the potential for discovering fossils, geodes, and even small crystals. Trek along the park's hiking trails, keeping an eye out for exposed rock faces and creek beds, which often yield impressive rockhounding finds.