One of the fun and interesting museums in the city of Washington, DC, this museum documents the history of aviation and space exploration through many interesting interactive displays, and through its temporary and permanent displays, the Smithsonian National Air and Space Museum maintains the largest and most important collection of aerospace and space artifacts, which includes all Aspects of the human journey, as well as related artwork and archival materials. It operates two notable facilities that together welcome more than eight million visitors annually, making it the most visited museum in the country, and it is also home to the Center for Earth and Planetary Studies.