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Appalachian Trail and Museum, Gardners, Pa.

Distance from Baltimore: 80 miles, less than a two-hour drive Why it's worth the gas: The museum is at Pine Grove Furnace State Park, about the halfway point on the more than 2,100-mile trail that runs from Maine to Georgia. It offers artifacts from the first end-to-end hikes. Don't miss: You... AMY DAVIS, Baltimore Sun