National Museum of Natural History

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., United States. With free admission and open doors 364 days a year, it is the most visited natural history museum in the world. Opened in 1910, the museum on the National Mall was one of the first Smithsonian buildings constructed exclusively to hold the national collections and research facilities. The main building has an overall area of 1.5 million square feet with 325,000 square feet of exhibition and public space. In total, the museum has the space of 18 football fields and houses over 1,000 employees.

The museum's collections total over 126 million specimens of plants, animals, fossils, minerals, rocks, meteorites, and human cultural artifacts. With 7.4 million visitors in 2009, it is the most visited of all of the Smithsonian museums that year and is also home to about 185 professional natural history scientists — the largest group of scientists dedicated to the study of natural and cultural history in the world.