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Recognized as a National Historic Landmark, Serpent Mound is a prehistoric earth mound in the shape of a large snake. The mound is approximately 1330 feet long and 3 feet tall, and carbon dating suggests it was built around 300 B.C., which suggests that it was made by the Adena people who inhabited the area between 800 B.C. and 100 A.D. The park is open to visitors every day between dawn and dusk, and there is also an interesting museum that's open daily between April and October. There is no admission fee, but visitors must pay to park their vehicles.

3850 OH-73, Peebles, OH 45660, Phone: 800-752-2757

Rating: ⭐⭐⭐⭐⭐

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