In the panorama of Sardinian Romanesque architecture, the church of San Paolo in Milis stands out as an authentic jewel. Its fame is linked in particular to the striking two-tone materials used in its construction, which include volcanites, basalts, limestones and greenish tuff. Various craftsmen were involved in the construction of the building, with stylistic influences recalling the cathedral of Santa Giusta and the Arborea area. The façade has an elegant tripartite design, characterised by three mirrors divided by round arches. The slender appearance of the structure is emphasised by the presence of pilasters, moulded arches and a finely worked architraved portal. The plan of the building takes the form of a 'commissa' cross, with an apse facing south-east. The architectural ensemble conveys a feeling of strength and lightness at the same time, capturing the attention and admiration of visitors due to its harmonious composition.