The complex of St Clement a Casauria, in the Municipality of Castiglione a Casauria, in one of the main access points of the District, represents the jewel of the Romanesque-Gothic style architecture in Abruzzi and one of the best examples of medieval religious architecture of Central-Southern Italy. The Benedictine complex, founded in 871, was dedicated to St Clement when the mortal remains of the martyr Pope were moved. The current aspect is given to Abbot Leonate who, from the second half of the 12th century, promoted the renovation of the Abbey calling important workforce from Cassino.