 Other elements that are visible on the plans are the locations of towers on the west fronts, porches such as those at Bourges and Salisbury, and the octagonal Chapter House at York Minster.Gothic churches were typically built in basilica form.Architecturally, a basilica has a longitudinal nave, with a lower aisle on each side, separated by rows of columns or piers, and generally with windows let into that part of the nave that rises above the outer roof of the aisles.