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Anywhere from several hours to all day and, as you're on the Mall, you can go in and out of all of the Smithsonian buildings there free of change.
National Museum of Natural History: Discover the Museum's Must-Sees
Tarantula feedings, the biggest blue diamond in the world, a Live Coral Reef... there is plenty for you to do at the worldβs largest natural history museum! Click here to learn more about the Museum's Must-sees.