I visited the National Mall, which is a tree-lined, grassy space, was part of Pierre L’Enfant’s in 1791 plan for the city of Washington. Today it stretches from the Capitol to the Lincoln Memorial and is lined on either side with buildings of the Smithsonian Institution. The interesting places I visited including the Smithsonian Institution, National History Museum, and Air and Space Museum. The Smithsonian Institutionis a group of museums and research centers administered by the United States government. The National Museum of Natural History is a natural history museum administered by the Smithsonian Institution, located on the National Mall in Washington, D.C. The museum's collections include specimens of plants, animals, fossils, minerals, rocks, meteorites, and human cultural artifacts. The National Air and Space Museum (NASM) holds the largest collection of historic aircraft and spacecraft in the world. It is a center for research into the history and science of aviation and spaceflight, as well as planetary science and terrestrial geology and geophysics. Almost all space and aircraft on display are originals or backups to the originals.