A stunning example of French Renaissance architecture, this château is famous for its distinctive French architecture, extensive grounds, and the double helix staircase attributed to Leonardo da Vinci. It is a UNESCO World Heritage site and attracts visitors for its historical significance and beautiful gardens.A stunning example of French Renaissance architecture, this château is famous for its distinctive French architecture, extensive grounds, and the double helix staircase attributed to Leonardo da Vinci. It is a UNESCO World Heritage site and attracts visitors for its historical significance and beautiful gardens.