The Carthusian of Vallparadís Castle in Terrassa, near Barcelona, is a medieval seigneurial residence that functioned as a Carthusian monastery from 1345 to 1415. Located within Vallparadís, one of Spain's largest urban parks, the castle stands as an authentic example of Catalan medieval architecture. Since 1959, it has served as the main branch of the Terrassa Museum, housing permanent exhibitions spanning from Medieval times through the industrial era. Visitors can explore the preserved castle structure in under an hour, accessing its principal chambers and ceremonial spaces. With accessible hours Friday through Sunday, the castle remains walkable from anywhere in Terrassa's city center, offering an intimate glimpse into medieval monastic and aristocratic life.