Itinerary to visit The National Mall 1. Start at the Smithsonian Castle: The Smithsonian Institution is a group of 19 museums and galleries, and the Smithsonian Castle serves as the information center for all of them. Pick up maps, get information on exhibitions and events, and learn more about the Smithsonian’s history and mission. 2. … Continue reading Tips For Experiencing The National Mall In Washington, D.C.