View of the Center Market, by Unknown, 1909, Smithsonian Archives - History Div, View of the Center Market of Washington, D.C. from the north entrance of the United States National Museum, now the National Museum of Natural History, on October 16, 1909. There are horse-drawn carriages and carts, vendors, storefronts, and the Old Post Office is in background, center. In the foreground is the large wooden gate to the grounds of the Natural History Building and a small guard house next to it..