There has been a church on the site of the cathedral since 1215. Another medieval survival is the Hanging Bridge across the filled-in Hanging Ditch, a stream south of the cathedral. All that remains are two sandstone arches now incorporated into the cathedral's visitor centre. When Thomas De la Warre obtained a licence to refound the church as a collegiate parish church, a college of priests was built of red Collyhurst sandstone on the site of his manor house. The college had a large hall, warden's lodgings and rooms for the priests. Two ancient halls survive outside the city centre, Clayton Hall is a rare example of a mediaeval moated site and Baguley Hall is a timber-framed hall from the 14th century.