The National Museum of Natural History is located in Washington, D.C. This Smithsonian Institution, like many museums during this time of pandemic, is closed to the public. But you can tour their online galleries quite easily. I highly recommend you explore Bone Hall, an exhibit devoted to a wide variety of skeletons. Many of the skeletons in the Bone Hall have been on view since 1881 and represent an unparalleled study collection of every major group of vertebrate animals.