The main building is one of the world's largest art galleries, at about in area. The Met is the most popular art museum in the United States with more than 5 million visitors each year. There is also a much smaller second location, the Cloisters. The Cloisters museum and gardens, which opened to the public in 1938, is a branch of the Museum. It is located in Inwood, in northern Manhattan. It has medieval art. The Metropolitan Museum of Art, which includes its Main Building on Fifth Avenue and the Cloisters in northern Manhattan, dates back to 1866.