The Smithsonian Institution’s headquarters in the National Mall is a red sandstone castle, the administrative office and information center of the Society. The main building was designed in 1965 and the red castle exudes an elegant and classical aristocratic temperament against the blue sky. As an information center, it contains information about all the Smithsonian Institution's museums in Washington, DC, and can get a map of the museums near the National Mall, which are free to visit. The castle itself is also a small museum, with a collection of some representative collections of museums under each Society, which is well worth visiting. Outside the Academy building is a beautiful garden for walking or rest, absolutely not to be missed.