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Purgatory Chasm in Sutton, Ma. Gorgeous in October.

"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."