I saw a video of this same technique years ago...and it was some group of high school kids that did it. So as far as I know, I consider them the inventors of this idea

I see that Veronica has already mentioned the old Danvers State Mental Institution in Massachusetts but I would like to reiterate her point. When I was a kid my friends and I would sneak up through the woods and look around the property which included the large main building and several other smaller, but no less scarier, buildings. This was only done during daylight hours and it was still creepy and scary as hell....I couldn't image being up there at night.
Too bad its now gone...