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. Admission is free and the museum is open 364 days a year. The museum's collections total over 500 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 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.