Take a tour of Smithsonian Castle in Washington, DC, United States – part of the World’s Greatest Attractions travel video series by GeoBeats. Anyone who says that America has no castles hasn't been to the National Mall. On this green expanse is the Smithsonian Institution Building, also known as the "Smithsonian Castle". This grand building was built in Norman style between the years 1847-1855. Complete with its own grounds and gardens, the castle would certainly look at home in Europe. The building is used as the administrative offices and information center of the Smithsonian Institute. The castle's tall towers look out look out over the area. For visitors to Washington DC's National Mall, this is an unforgettably unique sight.