Château de Chambord in Mont-près-Chambord is the largest and most celebrated Loire Valley château, constructed from 1519 by King Francis I with Italian and French collaboration. This architectural marvel contains over 400 rooms and nearly 300 fireplaces, anchored by Leonardo da Vinci's iconic double-helix staircase within a Greek cross-shaped keep. Encompassing 5,440 hectares completely enclosed by walls and 13,425 acres of landscaped grounds originally serving as a grand royal hunting lodge, Chambord became a UNESCO World Heritage Site in 1981 and remains a UNESCO World Heritage Site, representing an exceptional achievement of Renaissance design and royal ambition.
