hard to descirbe, its in the back where the train cars are. there is a big black blown up spot on the ground, lay down near the traincar and crawl into the blown up spot on the ground. you should be able to find this on youtube.
also on makin, if you go up in the woods, jump onto the back concrete lamp post (closest to the water, near the B bomb) then jump accross to the other lamp post, walk aroung the right, jump on the bricks, turn around, jump ON TOP of the lamp post, then turn around and jump into the center of the tree, you can no see 90% of the map with sniper
EDIT: glitch fixed finally
H-Sauce: Please edit your post and not double post