Smithsonian Institution (world's largest museum complex)

The Smithsonian Institution, headquartered in the Smithsonian Castle, is the world's largest museum, education, and research complex, comprising 19 museums and galleries plus the National Zoo. Its combined collections hold more than 154 million objects, works of art, and specimens across many disciplines. The majority of the Smithsonian museums and galleries are located on or near the National Mall in Washington, DC, and draw millions of visitors each year. The Institution was established by an act of Congress in 1846.