St. Lambert's Cathedral
Liège, Belgium · built 1185
St. Lambert's Cathedral (or in full, the Cathedral of Our Lady and St. Lambert, Cathédrale Notre-Dame-et-Saint-Lambert) was the Roman Catholic cathedral of Liège, modern-day Belgium, until 1794, when its destruction began. This enormous Gothic cathedral, dedicated to Saint Lambert of Maastricht, occupied the site of the present Place Saint-Lambert in the centre of Liège.
Cathedral data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).