Part of the sprawling Smithsonian Institution, the National Museum of American History is one of the most popular museums in the country, and it's easy to see why. The online exhibitions are excellent and explore topics like the disability rights movement, American sweatshops and the Star Spangled Banner. The Hands On Science Center has many fun activities for kids and adults alike, and the Timeline examines American history through the collections. A truly valuable guide to America's past.