This building is the Barood Khana of Lahore Fort, which means an arsenal depot. I can imagine that you must be thinking where it is inside the Fort, and I am sure that like many of us you also might not have heard about it earlier. Since partition it was hidden and later with the passage of time it got buried under loads of debris and waste. The building was abandoned and was suffering through serious neglect and damage when the walled city of Lahore authority started removing almost thousands of cubic feet of debris from it and finally the wonder was revealed.