Oxford University, founded in 1167, is the oldest university in the English-speaking world, one of the world's top public research universities and institutions of higher education, where 27 British prime ministers and 69 Nobel laureates studied or worked. Without the boundaries of gates and walls, more than 30 castle-style college buildings are scattered in Oxford City. The cobblestone streets run across the campus. They are simple, solemn and elegant in literature and art.