mine was a few weeks ago, when me and like 5 other people some how gained the access code to a privatley owned airport and we went on a bowl ride down the runway at 3 in the morning
theres this parking lot in like, the middle of my town, with a really busy street next to it, and inside the parking lot theres like 20+ tractor trailer things. Right in the middle of all of them is this abandon car with the hood open and everything gutted. My friend broke the lock on the door and 3 of us climbed in when we were really drunk and we didnt wanna be out in the cold at like 3 in the morning. it ended up being pretty nice on the inside, and we just smoked a blunt and sat there for an hour and then walked home. Then when we couldn't find a spot to smoke and we we're near it we'd always smoke there and chill there. It became known is my circle of friends as "The Cadillac". they ended up towing it out of there after about a month.
Carlsbad Caverns back when they allowed smoking in the lunchroom. It was all we had with us, so we said screw it. Had a friend out in Ca. who burned one in the Great Pyramid, pretty hard to top that one...
ditto - back of the top deck with windows open, though; got caught once - never again. all occupants of bus were 18+ (college).
i smoked in some woods on an elementary schools property while school was in session? idk if thats so much weird as it was stupid and risky, but whatever lol.
In a tree.... really high up, in the middle of a courtyard next to my college dorm. my favorite place to smoke is in my hot tub though.
in a portapotty during a street fair, and in the boys locker room in high school once. this place, too:
In the high school pool, just walked around deck smokin' a bowl then in the back room of the place and blazed a friend up too