When I was in high school, I used to have the keys to a locked portion of the stage. If you went in there, behind what looked like a locked closet, there was access to some heating ducts. If you climbed up a small ladder you could crawl along the ducts (really safe, no big deal). I drilled a small hole thru the wall and, lo and behold, I could see right into the girls changing room. I would have been about 10 or 12 feet above floor level.
It was great. I used to go up there and check out the girls (I was in grade 11). I was drawn more to the grade eight girls. I would watch them undress, undo their bras and walk around with little tits bouncing. I loved checking out their pubic hair.
I would spend perhaps an hour or two a week up there masturbating away. God, I loved that spot. I would go up during dress rehersals for plays and before all the girls PE classes!!