Well, I was able to knock out the windows, but that's what was confusing me. The windows didn't seem to ~lead~ any... waitaminute. Are you saying there's an area transition right on top of the windows where the broken glass makes it hard to see? >.> ~goes to check~
EDIT: No, that's not it... To clarify: in the house to the right of the two landmines with an axe between them, about level with the two pairs of windows there is a refrigerator and a metal box that seem to block access to the rest of the house. Breaking the north windows doesn't lead anywhere (and even if it did it would just be to that little zombie pen with the well) and breaking the south windows also doesn't seem to lead anywhere.