There was this "sealed with boards" sort of entrance that had caused this sort of issue for me as well. Looked like a mine entrance. Some collect able is just inside this small zone just at BOTTOM of slope.
Unsure of whether inside side of wall or out of town. Ended up having to rotato the camera.
xbL gT @ megatr0n e5kim0 ^^^ Casual player of Pokemon and Animal Crossings. Currently Lv. 10ish in Borderlands 2