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Follow Olentangy CavernsThe Olentangy Caverns were formed millions of years ago by an underground river that cut through the limestone rock. Today the caverns are open to the public for tours. The 50-acre outdoor space also offers fun family activities above ground including gem mining, a petting zoo, miniature golf, and free outdoor games (corn hole, giant checkers, and a children's horizontal climbing wall, to name a few). Picnic tables are offered for free. The covered shelter house is available to rent for group events and birthday parties.