 Each tower is crowned by a decorative urn in each corner and a lantern, which consists of a square-based lower stage and an octagon-based cupola upper stage.The lower stage of the lantern is pierced by a tall, open, round-headed arch in each face while angled buttresses with half-fluted double Ionic pilasters support each corner.The buttresses are capped by decorative scrolls that rest against the intermediate faces of the octagonal cupola while oculi pierce the cardinal faces.