I've been to another in the same city quite a few times as it's easier to get into and has less security but it wasn't on Halloween nor has it been closed nearly any length of time I believe less than ten.
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I used to go "exploring" old and empty buildings with some friends a while back. One of us is quite the photographer/photoshop badass.
Some of his photos (the effects are obviously shopped)
and this last one is truly amazing... wish I was there when he found that. I think it was an old villa or something like that.