Maryland Heights is the prominent ridge on the Maryland side of the Potomac, directly across from Harpers Ferry, and the hike to its summit is the best short walk in the area. The trail begins at the C&O Canal towpath, crosses the Potomac footbridge, and climbs steeply through hardwood forest to the summit, where Civil War fortifications — stone walls, earthworks, and the ruins of a naval battery — occupy a clearing with 360-degree views.
The view from the top looks directly down into the confluence of the Shenandoah and Potomac Rivers and over the entire lower town of Harpers Ferry. The ridgeline walk continues to Loudoun Heights on the Virginia side if you want a longer day. Round trip from the Harpers Ferry parking area is about 10 kilometers with 400 meters of climbing — not casual, but very rewarding. Carry water; there is none on the ridge.