Under a swath of Kentucky hills and hollows is a limestone labyrinth that became the heartland of a national park. The surface of Mammoth Cave National Park encompasses about 80 square miles.

From Redding (about 45 miles away), take Calif. 44 east to Calif. 89 junction and continue to Manzanita Lake Park Entrance; from Red Bluff, follow Calif. 36 east to Mineral, turn north on Calif.