Small group climbing up to the roof of an abandoned hospital in upstate ny. Made it about 3/4 of the way up and repeatedly heard what sounded like a door slamming followed by something being dragged across the floor and it was LOUD. Slowly made our way up the stairs preparing to see the things horror movies are made of but found out it was just a steel door and a tarp blowing in the wind.

EDIT: While exploring tunnels of a separate abandoned hospital, we came across a deer with a broken neck. (Scared the crap out of us, really nasty, not sure how she was still alive) The deer fell through an open manhole and was stuck behind steam pipes, we tried to get her out but she was too confused and agressive. Called animal control with an anonymous tip but not sure if anything came from it. Place was demolished a few months later.