The ancient part of the town is in a spectacular position on the top of a hill, where it preserves a particular medieval historical center, with ruins of a castle (Castello della Fava) and a square panoramic tower of 13th century.
The castle has been the equivalent of a holiday residence for the Giudichessa Eleonora d'Arborea, and was object of alternate possession by the Giudicato d'Arborea and the Aragon, during the long fight before the spanish conquest.
The castle became then the seat of the Baron of Posada, a title and a fief created in 1431 for Don Nicoḷ Carroz and formally ended in 1856, when it was finally bought by the kingdom of Sardinia (the last one of all Sardinian fiefs).
In its territory should have been the Etruscan or Nuragican temple and city of Feronia, now lost, and with this name Posada is in ancient maps.