I haven’t been here (yet).
Notre-Dame Cathedral in Tournai
The Cathedral of Notre-Dame in Tournai was built in the first half of the 12th century. It is especially distinguished by a Romanesque nave of extraordinary dimensions, a wealth of sculpture on its capitals and a transept topped by five towers, all precursors of the Gothic style. The choir, rebuilt in the 13th century, is in the pure Gothic style. [source]