Ohioans love to swim in rock quarries, kayak on quarries, hike around quarries and occasionally cliff jump into quarries. Unfortunately, not all formerly working rock quarries are safe for swimming, thanks to their deceptively cold/deep waters and murky underbellies. But these Ohio spots are approved for the public in one way or another. So bask in the one last long, warm weekend of summer and get thyself to a quarry today.