The University of Oxford is the oldest university in the English-speaking world, with evidence of teaching as early as 1096. It is not a single campus but a collection of 39 self-governing colleges spread throughout the city center. The landmark most associated with Oxford is the Radcliffe Camera, a circular library built in the mid-18th century to house the Radcliffe Science Library. Another iconic site is the Bodleian Library, one of the oldest libraries in Europe and a 'legal deposit' library, meaning it is entitled to a copy of every book published in the UK. The university’s architecture earned Oxford the nickname 'City of Dreaming Spires,' a term coined by poet Matthew Arnold. Its halls and libraries have served as filming locations for the Harry Potter series, further cementing its status as a global cultural icon.