The site represents the perfect example of socio-cultural, artistic, and religious fusion among the occidental culture, the Islamic and the byzantine one.

It concerns nine historical buildings (two palaces, a bridge, three churches, one cathedral in Palermo plus other two cathedrals in Monreale and Cefalù, two little villages near the country seat) that show how brilliant and clever were Muslims, Normans, and Byzantines but also the heterogeneity of architectural elements which were part of different cultures with opposite styles.