What is the most famous museum in the United States?

The most famous museum in the United States is the Smithsonian Institution in Washington, D.C. Established in 1846, the Smithsonian is a group of museums, galleries, and research institutions, including the National Museum of American History, the National Air and Space Museum, and the National Museum of Natural History. The Smithsonian’s vast collection spans millions of objects, showcasing the history, culture, and achievements of the United States and the world. The museum complex attracts millions of visitors each year and offers free admission to all of its museums.