On the Maryland side of the Potomac you can walk from Harpers Ferry all the way up to Shepherdstown or further courtesy of the C&O Canal. On the West Virginia side things are a little more limited. But you can walk along the river a way. Which is what I did here, walking until I reached an old rubble dam usually refered to as Dam # 3 (but originally apparently called the Armory Dam).
As you can see it makes for an impressive panoramic view of the river.
Potomac Panorama by Eoghann Irving, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.