Approximately 15 miles south of Newcastle-upon-Tyne, the city of Durham has been settled for over 1,000 years. Celtic monks were the founders of Durham, and when they settled the area, they moved the remains of monk St. Cuthbert here as well, and his remains now reside in Durham Cathedral. The 11th-century Durham Castle was the home of the Anglican Bishop of Durham until the 19th century. Both of those sights are listed as UNESCO World Heritage Sites. Much of the old town sits on an area around the River Wear called `The Peninsula`.