This Carthusian monastery lies about three kilometers outside the historic town of Burgos. The building was originally the hunting lodge and recreational palace of Henry III of Spain. The palace was restored by his son, King John II, and renovated again during the reign of Queen Isabella by renowned architects. The Carthusian monastery is a gem of 15th-century Gothic architecture. The monastery's exquisite Gothic church is one of the most important monuments of Burgos and contains the mausoleum of King John II and his wife Queen Isabella. Guided tours are available in summer.