Romanesque style developed in medieval Europe between the 6th-12th centuries and was characterized by semi-circular arches. Durham Cathedral, built between 1093-1133, is an important example of Romanesque architecture known for innovations like rib vaulting. Its pointed arches allowed greater height and width over previous semi-circular styles. Other features include thick walls, barrel vaults, arcades supported by cylindrical and compound piers, and three towers up to 218 feet tall.