Kent is a county in southeastern England. In the city of Canterbury, Canterbury Cathedral has a 1,400-year history, and features a Romanesque crypt and medieval stained glass. The underground Canterbury Roman Museum has excavated mosaics. Whitstable, to the north, is a coastal town with colourful cottages and a harbourside fish market. East, along the coast, Margate is home to the Turner Contemporary art gallery. Canterbury Cathedral in Kent has been the seat of the Archbishop of Canterbury, leader of the Church of England.