Just outside the "City of Brotherly Love," Blue Mountain's Pinnacle, a rocky promontory, affords stunning views of Berks and Lehigh counties. If you follow the 9-mile loop past Pulpit Rock before arriving at the summit, you'll be hiking part of the Appalachian Trail. Just be prepared to scramble – the trail is rocky.
Credit: Songquan Deng / Alamy
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