TED: Ideas worth spreading. Bobby McFerrin hacks your brain with music. Pattie Maes and Pranav Mistry demo SixthSense. Justice with Michael Sandel - Home. Smithsonian: Museums. The Smithsonian Institution—the world’s largest museum and research complex—includes 19 museums and galleries and the National Zoological Park. Most Smithsonian museums and the National Zoo are free and open every day of the year except December 25. For hours of operation, see information on planning your visit or select a museum from the list. Note: Additional Smithsonian exhibitions and events can be found in the S. Dillon Ripley Center on the National Mall.
Also Learn About Our Research Centers » Smithsonian Gardens » Many visitors are surprised to learn that the Smithsonian Institution includes a number of outdoor museums. From mid-April through September there are weekly garden tours available (weather permitting).