The Monastery of Santa Catalina de Siena in Arequipa is a 16th-century religious complex founded in 1579. Enclosed within high walls, it functioned as a cloistered convent for centuries, housing nuns from wealthy Spanish families. Spanning over 20,000 square meters, the monastery is a city within a city, featuring narrow streets, colorful buildings, and tranquil courtyards. Its architecture blends Spanish colonial and indigenous influences.