Boston Public Library (BPL) was the first large free municipal library in the United States. The present Copley Square location has been home to the Library since 1895, when architect Charles Follen McKim completed his "palace for the people." Between 1870 and 1900, twenty-two additional Branches began serving communities throughout Boston's diverse neighborhoods. In 1972 the Library expanded its Copley Square location with the opening of an addition designed by Philip Johnson. Today, the McKim building houses the BPL's vast research collection and the Johnson building holds the circulating collection of the general library and serves as headquarters for the Boston Public Library's 26 branch libraries. In addition to its 6.1 million books, the library boasts over 1.2 million rare books and manuscripts, a wealth of maps, musical scores and prints. Among its large collections, the BPL holds several first edition folios by William Shakespeare, original music scores from Mozart to Prokofiev's "Peter and the Wolf;" and, in its rare book collection, the personal library of John Adams. Over 2.2 million patrons visit the BPL each year, many in pursuit of research material, others looking for an afternoon's reading, still others for the magnificent and unique art and architecture.