The general public is encouraged to visit and tour many NASA centers. Some NASA facilities operate their own visitor centers, while others have contractual arrangements with private firms. Some centers do charge admission fees.
NASA Headquarters, 300 E St. SW, Washington, D.C. NASA Headquarters does not have its own visitors' center, but it is located four blocks south of the Smithsonian Institution's National Air & Space Museum (http://www.nasm.edu/), which houses an extensive collection of aeronautics and space program artifacts.
To check on hours, admission and tour availability, visit these Web pages: