 The bridge over the river was built from 1556 to 1559 to designs by the French Renaissance architect Philibert de l'Orme, and the gallery on the bridge, built from 1570–1576 to designs by Jean Bullant.Built by Jules Hardouin-Mansart, 1675–1683 for the duc de Chevreuse, Colbert's son-in-law, is a French Baroque château of manageable size.Protected behind fine wrought iron double gates, the main block and its outbuildings ("corps de logis"), linked by balustrades, are ranged symmetrically around a dry paved and gravelled "cour d'honneur".