 Large paired towers of square plan could also occur on the transept ends, such as those at Tournai Cathedral in Belgium.In Germany, where four towers frequently occur, they often have spires that may be four or eight sided, or the distinctive "Rhenish helm" shape seen on the cathedrals of Limburg or Speyer.It is also common to see bell or onion-shaped spires of the Baroque period surmounting Romanesque towers in central and Eastern Europe.