The Cordouan Lighthouse is a historic lighthouse located in the Bay of Biscay, off the west coast of France. It was constructed in the 17th century and is considered to be one of the most beautiful lighthouses in the world, known for its striking architecture and intricate details. The lighthouse is built on a rocky island that is accessible only by boat and is the oldest lighthouse still in operation in France. It was designated a UNESCO World Heritage Site in 2020. Visitors can take a guided tour of the lighthouse and learn about its history and importance in maritime navigation.