Harper's Ferry, West Virginia

First picture is looking roughly east into Virginia and Maryland.  Third picture is Jefferson Rock, visited by Thomas Jefferson himself.

South Mountain National Battlefield

The Battle of South Mountain was a series of engagements that took place just before the Union's costly victory at Antietam to the west a few days later.  It's a nice little park but maybe not the best example of a walking battlefield.  (Try Antietam!)  It also overlaps with the Appalachian Trail.