holdings are dispersed at subject and location libraries. Rare books are found in several Yale collections. The Beinecke Rare Book Library has a large collection of rare books and manuscripts. The Harvey Cushing/John Hay Whitney Medical Library includes important historical medical texts, including an impressive collection of rare books, as well as historical medical instruments. The Lewis Walpole Library contains the largest collection of 18th‑century British literary works. The Elizabethan Club, technically a private organization, makes its Elizabethan folios and first editions available to qualified researchers through Yale. Yale's museum collections are also of international stature. The Yale University Art Gallery, the country's first university-affiliated art museum, contains more than 200,000 works, including Old Masters and important collections of modern art, in the Swartwout and Kahn buildings. The latter, Louis Kahn's first large-scale American work (1953), was renovated and reopened in December 2006. The Yale Center for British Art, the largest collection of British art outside of the UK, grew from a gift of Paul Mellon and is housed in another Kahn-designed building. The Peabody Museum of Natural History in New Haven is used by school children and contains research collections in anthropology, archaeology, and the natural environment. The Yale University Collection of Musical Instruments, affiliated with the Yale School of Music, is perhaps the least-known of Yale's collections because its hours of opening are restricted. The museums once housed the artifacts brought to the United States from Peru by Yale history professor Hiram Bingham in his Yale-financed expedition to Machu Picchu in 1912 – when the removal of such artifacts was legal. The artifacts were restored to Peru in 2012. Rankings The U.S. News & World Report ranked Yale third among U.S. national universities for 2016, as it had for each of the previous sixteen years. Yale University is accredited by the New England Commission of Higher Education. Internationally, Yale was ranked 11th in the 2016 Academic Ranking of World Universities, tenth in the 2016–17 Nature Index for quality of scientific research output, and tenth in the 2016 CWUR World University Rankings. The university was also ranked sixth in the 2016 Times Higher Education (THE) Global University Employability Rankings and eighth in the Academic World Reputation Rankings. In 2019, it ranked 27th among the universities around the world by SCImago Institutions Rankings. Faculty, research, and intellectual traditions Yale is a member of the Association of American Universities (AAU) and