California Academy Of Sciences is the largest natural history museums in the world. It is home to an Aquarium, Planetarium, Natural History Museum, Rainforest, 40,000 live animals and more.
National Air and Space Museum (NASM) in Washington, DC. Explore amazing variety of planes and rockets as well as crafts of all sizes and shapes from a variety of different eras as well as places. It also aeronautic research center.