In Milan, one of these structures in the Rayonnant tradition combines the Flamboyant and Perpendicular styles.
In Milan, one of these structures in the Rayonnant tradition combines the Flamboyant and Perpendicular styles. One of these structures worked on by Domenech Sugranyes consists of pillars topping stone turtles, and has eighteen towers and three facades. Rose windows are prominent on these structures, such as one located in Reims. Their interiors can have specialized openings called apses. In Italy, these buildings are referred to as duomo. During the Gothic Era, the thrusts of these buildings became supported by flying buttresses. For 10 points, identify these religious buildings, examples of which include the unfinished Sagrada Familia and the Notre Dame.   
In Milan, one of these structures in the Rayonnant tradition combines the Flamboyant and Perpendicular styles.
cathedral [or church or chapel; accept Duomo before mention; do not accept "Basilicas"]