The archaeological site of Montessu-Villaperuccio is considered to be the most important in the whole Mediterranean. It is a necropolis located in a splendid natural amphitheatre in which more than 40 Domus de Janas (the 'fairy houses' or 'witch houses' of Sardinian folk tradition) or prehistoric tombs were excavated around 6,000 years ago. In some of them, there are still visible traces of painting made with red and yellow ochre, while in others there are engraved important symbols related to Neolithic fertility such as spirals and bovine Protomes.