Cardiff boasts more castles than any other city in Europe. Alongside the central fortress of Cardiff Castle, the city is home to Castell Coch and St Fagans Castle. Cardiff ranks as one of the flattest cities in Britain. It also contains more green space per person than any other UK core city, with Bute Park alone spanning roughly 75 football pitches. Cardiff contains the highest concentration of Victorian, Edwardian, and contemporary indoor shopping arcades in the world.