Château de Maintenon, located near Chartres in Eure-et-Loire, evolved from its 12th-century origins into a prestigious residence embellished by its most famous owner, Madame de Maintenon, the second spouse of Louis XIV. The château blends a 13th-century square keep with 16th-century brick towers reflecting Gothic and Renaissance styles, accompanied by formal gardens designed by André Le Nôtre. Most remarkably, the estate features the spectacular ruins of an incomplete aqueduct originally intended to supply water to Versailles' fountains, creating a hauntingly beautiful backdrop. Now managed by the departmental council as a protected historical monument, it stands as a testament to architectural and cultural significance.