Falls of the Ohio State Park is a one-of-a-kind museum, nature center and tourist attraction perched on an ancient coral-sea limestone outcrop overlooking the Ohio River in Clarksville. Across the river lies Louisville, Ky. Unique natural history displays range from a saltwater coral aquarium to showboats to workboat whistles. During a school field trip at the park last fall, fifth-grader Andrew Smith seemed most interested in a wooly mammoth skeleton.

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