Might be a private matter and you could get in trouble for snooping around. That, or you might find a small group of kids getting high. There were a few underground caves in Florida with graffiti and trash lying about that were clear indications of teens fooling around in there. Kids seldom turn down the opportunity to check out a new hidey hole to hang out in.
Cyberdevil
Oooh that's pretty spooky! :D Adventure time? Venture climb down that rabbit hole...? You do wonder what lurks down there in that abyss...
ithoughtiwascrazy
Well I decided that I am not going back, especially if I am alone. I think it'd be stupid to go back alone. I still do wonder what does lurk down there. Just hopefully it's not animated skeletons or a psycho. XD