detail of bell tower with single-lancet, double-lancet and triple-lancet windows of st apollinare in ravenna northern italy

apollinare apollinaris basilica belfry bell tower belltower building byzantine church cylindrical doublelancet emilia romagna emiliaromagna italy monofora mullion place of worship ravenna religion religious saint sant singlelancet singlelight window spire st three windows threelight trifora triple triplelancet shape cylinder round roundish