The Louvre is one of the world’s largest museums, and a historic monument. The Musée du Louvre contains more than 380,000 objects and displays 35,000 works of art in eight curatorial departments with more than 60,600 square metres (652,000 sq ft) dedicated to the permanent collection. The collection of the Louvre Museum was first established in the 16th century as the private collection of King Francis I. One of the works of art he purchased was the now famous Mona Lisa painting. The collection grew steadily thanks to donations and purchases by the kings. In 1793, during the French Revolution, the Louvre became a national art museum and the private royal collection opened to the public.