Ohio Caverns is one of Ohio's top tourist attractions around. The caverns were formed thousands of years ago due to an underground river that cuts through ancient limestone. This resulted in large passageways that filled up with numerous crystal stalactites, stalagmites and other spectacular formations. The caverns are the largest in the state and have over 2 miles of surveyed passageways that range 30 feet in depth to the deepest point of 103 feet. For more information about the Ohio Caverns or to book your next tour, please visit their website or contact them today.