Notre-Dame-la-Grande is a Romanesque collegiate church located in Poitiers . Characteristic of the Poitevin Romanesque style, its sculpted facade is a unanimously recognized masterpiece of religious art from this period. The interior walls are painted. The plan of the church consists of a central nave with very high side aisles according to a pattern common in the Romanesque architecture of Poitou. From the inside one has the effect of a single-level hall church . The barrel vault has a slightly flattened silhouette, while the aisles are covered with a groin vault .