Wheeling-Pittsburgh Steel Corp., Steubenville, Ohio.
According to Wikipedia we explored this place only one month after they began laying off employees. As of right now most of the place is demolished. In June 2013 the remaining pieces of the blast furnaces will be brought down with controlled demolition. A few buildings remain towards the front of the complex but will probably be demolished soon after.
The Pines Hotel, Germany.
By Niki Feijen