Olentangy Indian Caverns
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The Olentangy Indian Caverns are a series of natural underground caves, passages, and rooms occupying three different levels. The caverns were formed millions of years ago by an underground river that cut through the limestone rock. They were used by the Wyandotte Indians as a refuge from the weather and from their enemies the Delaware Indians. The Olentangy Indian Caverns are located at 1779 Home Road, Delaware, Ohio and are open seasonally for tours.
On the property, a petting zoo, minigolf course, and mock gem mine are offered, as well as a gift shop. A covered picnic area can also be rented out. There is also a museum, which houses artifacts found in and around the caverns. 
The caverns were formed millions ago by dissolution of limestone from an underground river. The caverns are believed to have been used by the Wyandotte Indians. The Caverns were rediscovered in 1821 by J.M. Adams, a nearby camper, who was a member of a wagon train. The caverns include many, many openings and passages, but have not been fully explored.
- "Olentangy Indian Caverns - History". Olentangy Indian Caverns. Retrieved 18 November 2013.
- "Activities". Olentangy Indian Caverns. Retrieved 28 April 2017.
- "Shelter House Rental & Birthdays". Olentangy Indian Caverns. Retrieved 28 April 2017.
- "Olentangy Indian Caverns - History". Olentangy Indian Caverns. Retrieved 28 April 2017.
- Olentangy Indian Caverns - official site