A unique natural landmark, Purgatory Chasm runs for a quarter of a mile between granite walls rising as high as 70 feet. Popular with picnickers and rock-climbers alike, the Chasm is believed to have its origin in the sudden release of dammed-up glacial meltwater near the end of the last Ice Age, approximately 14,000 years ago. Trails lead to a wide variety of rock formations, with such romantic names as The Corn Crib, The Coffin, The Pulpit, Lovers' Leap and Fat Man's Misery.