I've passed this forbidden place for years on downtown Pittsburgh's "Jail Trail" (a walking/biking trail so named for its proximity to the jail). I like the irony of the sign. It's a little overexposed, but I thought that added to the contrast and overall harsh effect.
EDIT: One of the comments made me think to add that this shot is about two miles from the jail, so it really has nothing to do with that. The "Jail Trail" originates at the jail, but is a rails-to-trails project that runs several miles along the Mon River.