La Alameda's Castle is a 15th-century fortress built between 1431 and 1476 by the Mendoza family on a small hill near Madrid. Originally constructed as a military fortification with a moat, rectangular floor plan, and two towers, the castle underwent a dramatic transformation in 1575 into a Renaissance leisure villa complete with grand windows, formal gardens, fountains, and tree-lined paths, becoming a favored summer retreat for Madrid's nobility. Though devastated by fire in 1697 and subsequently abandoned, the castle remains one of only four surviving medieval fortifications in Madrid, now accessible via public transit to the Alameda de Osuna district.
