Museums are a wonderful way to learn more about our ancestry and the areas out ancestors lived. Washington DC has the best museums, many are free and all have something different to offer. Everyone should have the opportunity to visit in person but if you can't, these websites offer an in depth view of some of the best sources out there.
Cooper-Hewitt National Design Museum
Hirshorn Gallery and Sculputers
National Air and Space Museum, Chantilly, VA
National Museum of African Art