The S. Dillon Ripley Center, better known simply as the Ripley Center, is one of the buildings of the Smithsonian Institution series of museums located in the National Mall in Washington, D.C. The above-ground portion is only a small pagoda, and it descends into a larger underground portion. The Ripley Center houses the International Gallery, The Smithsonian Associates, and the offices of the Smithsonian Contributing Membership. It contains a conference center, an art gallery, and meeting/class rooms as well as exhibition space. It connects underground to the Arthur M.