Rockopolis

Rockopolis - This location is not a major landmark nor a random location and will NOT be easy to find. How i found it was starting on the WEST Side of Smith Casey's Garage and keep going that direction until you are about right in the Middle of the next Square Zone in your Pip-Boy. It is a ROCK WALL with a few Trees and a Decoration hanging off it. IF you got the Encounter of the Mole Rats Attacking a Wastelander its just near there just go a bit South West (Starting from the Dead Body, Not very far) Check the Rock Wall. It also helps if you search at night, the very bright light coming from the wall greatly increases visibility.

BobbleHead-Unarmed Location - It is inside Rockopolis near the Dead Body of Argyle.