The Mosteiro de Santa Maria de Alcobaça is a historic monastery located in the town of Alcobaça, Portugal. Founded in 1153 by the Cistercian order, it is one of the earliest Gothic structures in the country. The monastery is renowned for its impressive architecture, including a stunning church and beautiful cloisters, which reflect the monastic lifestyle of the time. In 1989, the Mosteiro de Santa Maria de Alcobaça was designated a UNESCO World Heritage Site due to its cultural significance and architectural beauty. The site is also famous for the tombs of the tragic lovers Pedro and Inês, which attract many visitors each year.