A church in the Brabantine Gothic style with an unfinished tower. Also known as the Onze-Lieve-Vrouwe-Kerk ('Our Dear Lady Church') or simply the Grote Kerk ('Great Church') was built between 1285 and 1470. The 65 m tower contains a carillon with 67 bells including one weighing 9.83 tonnes, making it the heaviest bell in the Netherlands. Be sure you're in shape to climb the tower and not afraid of close spaces. The steps are steep and there is only one way up ... or down. You can see the medieval clock in operation. In the church, see the brilliant stained glass windows and especially the modern window dedicated to the guilds of Dordrecht.