It all began with a landing on the wonderful and at that time deserted beach of Cala Sinzias. This event led to the creation of the biggest Italian agricultural penal structure, which has now become an elegant administrative and cultural centre and the ‘heart’ of a young municipality. The former penal colony of Castiadas is located in the central hamlet, one of the sixteen dotted between the coast and the hinterland, creating the ‘scattered’ village, which became autonomous in 1986. Thirty prisoners and seven prison guards from Cagliari reached the area by sea in August 1875 to start reclamation work after centuries of abandonment. In fact, the Sarrabus region was a marshy territory, uninhabited due to malaria and plague epidemics. The first nucleus of the colony originated on the hill of is Praidis and later on, also thanks to the addition of hundreds of other prisoners, numerous structures were built until it developed into a real self-sufficient citadel.