Historical Boston is one of the most beautiful, but underrated cities in the world. Likewise its library system. Founded in the mid-19th century, the Boston Public Library (BPL) is strongly associated with the emergence of education for the working class. Its unique architectural style was maintained when Philip John designed an additional section in 1972. Serving as both a research library and headquarters for Boston Public Library's 26 branch libraries, the main library branch also holds a large collection of rare books and manuscripts and musical scores.