The 'bald' mound of rubble allows one to fall in, once under the map, working the way to the Citadel by going left when possible. There are a few mounds of rubble that one needs to get to the top. It is possible to obtain the perk without completing any quests past Escape! There is a mapping bug northwest of the entrance to the Citadel on the Arlington Bridge (The only bridge that fully crosses the Potomac River).
Afterward, speak to Paladin Gunny in the Bailey (courtyard) of the Citadel to receive the perk.
