Located in Hocking Hills State Park between Upper Falls and Old Man's Cave is a tiered waterfall that drops into a whirling pool of water in a bowl-shaped basin. Although it was believed that the pool was of an unfathomable depth, it's actually only just a few feet deep. Start your hike at the visitor center and walk for one mile on the Buckeye Trail. Go past the spectacular Upper Falls and you'll come across the Devil's Bathtub which you can view from a stone bridge above the basin. The park is open every day from dawn to dusk.