The Appalachian National Scenic Trail. The trail in Maryland follows a forty-mile route along the backbone of South Mountain, a north-south ridge that extends from Pennsylvania to the Potomac River. This section is great for three- or four-day trips, is easy by A.T. standards, and is a good place to find out if you're ready for more rugged parts of the Trail.
#12 Appalachian Trail: Crampton Gap to Harpers Ferry, WV: The 9.8-mile stretch of Appalachian Trail leading from Crampton Gap to Harpers Ferry, West Virginia, is one of the most popular and rewarding AT day hikes in this region, with good reason. It features a secluded forest ridgetop, an exhilarating vista pitching straight down into the Potomac River, and the historic Chesapeake & Ohio (C) Canal Towpath.
The official National Park Service strip map for the trail, scanned, and split into 5 images: Maine & New Hampshire; Vermont, Massachusetts, Connecticut, New York, & New Jersey; Pennsylvania, Maryland, & Virginia; Virginia; and Tennessee, North Carolina, & Georgia.