The National Gallery of Art is a national art museum, located on the National Mall in Washington, D.C. Open to the public free of charge, the museum was established in 1937 for the people of the United States of America by a joint resolution of the United States Congress, with funds for construction and a substantial art collection donated by Andrew W. Mellon. Additionally, the core collection has major works of art donated by Paul Mellon, Ailsa Mellon Bruce, Lessing J. Rosenwald, Samuel Henry Kress, Rush Harrison Kress, Peter Arrell Brown Widener, Joseph E. Widener and Chester Dale. The Gallery's collection of paintings, drawings, prints, photographs, sculpture, medals, and decorative arts traces the development of Western Art from the Middle Ages to the present, including the only painting by Leonardo da Vinci in the Americas and the largest mobile ever created by Alexander Calder. The Gallery's campus includes the original neoclassical West Building designed by John Russell Pope, which is linked underground to the modern East Building designed by I. M. Pei, and the 6.1-acre (25,000 m2) Sculpture Garden. Temporary special exhibitions spanning the world and the history of art are presented frequently. Text from: en.wikipedia.org/wiki/National_Gallery_of_Art