The ‘Knights of Hills’ Museum, organized inside the old town hall of Masullas, was inaugurated on 15 May 2013, becoming to all effects one of the cultural benchmarks of this small village. Inside the museum is told the story of the rural aristocracy formed with the advent of feudalism and its implications in the administration of justice, both civil and ecclesiastical. Its mission is to promote the knowledge and the comparison between the new generations, on the historic evolution on the themes of justice and legality, constituting a cultural path only in the national scene. An intriguing space historical-cultural finalized to the knowledge of the general public of historical reality that for over five centuries has characterized the social and economic life not only of Masullas and part Montis, but of the whole Sardinia in the becoming of its socializing.