The front entrance of Union Station, in downtown DC. From the webpage:
At the time it was built, the Station covered more ground than any other building in the United States and was the largest train station in the world. The Station sits on the edge of an area once known as “Swampoodle,” an infamous shantytown located on the sewery remnants of Tiber Creek. The total area occupied by the Station and the terminal zone was originally about 200 acres and included 75 miles of tracks.