Luynes is a commune in the Indre-et-Loire department in central France. The Castle of Luynes has been registered as a historic site since 192…Luynes is a commune in the Indre-et-Loire department in central France. The Castle of Luynes has been registered as a historic site since 1926. The construction started in the 13th century, and the building was redesigned in the 15th and 17th century.