Mentioned by Washington DC 2 days itinerary
Two Days in Washington DC: A 48 Hour Itinerary
"The most popular are the Air and Space Museum, Natural History Museum, and American History Museum. Choose the museum that interests you most and spend a few hours exploring. At the National Air and Space Museum, see the original Wright 1903 Flyer, the "Spirit of St. Louis," and the Apollo 11 command module. At the National Museum of Natural History, take a look at the Hope Diamond and other gems and minerals, examine the massive fossil collection, visit the 23,000-square-foot Ocean Hall, see a life-size replica of a North Atlantic whale and a 1,800-gallon-tank display of coral reef."