The Cathédrale Notre-Dame de Rouen is one of the great Gothic cathedrals of France, begun in the 12th century and not finished until the 16th. The west front is a riotous overlay of styles — the Tour Saint-Romain plain Romanesque, the Tour de Beurre (paid for by Lent dispensations) flamboyant Gothic, the central spire a 19th-century cast-iron addition that briefly made the cathedral the tallest building in the world.
Inside, the long nave is solemn and dim, with stained glass dating back to the 13th century. Look in the ambulatory for the tomb of Richard the Lionheart, who chose to have his heart buried in Rouen, the historical capital of his Norman duchy.