Take a tour of Notre-Dame Cathedral in Tournai in Belgium -- part of the World's Greatest Attractions series by GeoBeats. When exploring Belgium's architecture, start with Notre Dame Cathedral in Tournai. The cathedral was first built in the twelfth century but was added on to afterwards. The cathedral showcases multiple medieval architectural styles at one site including Romanesque and Gothic. Tournai Cathedral was made a UNESCO World Heritage site in 2000 because of this. It sits on the Scheldt River and is constructed of bluish gray stone. Belgium's history is as rich as its food. Discover Notre Dame Cathedral in Tournai.