The town came into being during the Middle Ages at the feet of a castle as the groups of structures around it, sas plassas, came together to form a village. Las Plassas is one of the island’s smallest villages, with only 250 inhabitants. It rises in the fertile valley of the Flumini Mannu, its characteristic low houses graced with expansive courtyards nestled around the parish church of San Sebastiano, the patron saint whose feast day is celebrated in January with a huge bonfire. The church dates to the middle of the XVII century and has since been renovated. The town’s main church is Santa Maria Maddalena, a renaissance building constructed at the feet of the castle between the XVII and XVIII century over the ruins of a Byzantine structure. It had a Greek cross floor plan that was then changed into a Latin cross. The octagonal dome and bell-gable with a XVI century bell are all that remain of the original structure. On the outskirts is Santa Maria di Monserrato (late XIV century), home to a Nuragic Age sacred well. It was built in an historically frequented area, nearby is a Punic-Roman oven. Three cross arches divide the hall into four sections. The most heartfelt celebrations here take place on 8 September, while a yearly legume festival is held in late September.