The Tower was built in the thirteenth century, in Norman times, probably on a pre-existing guard tower of the Lombard era. It was part of a sighting system for the defense of the territory from invading enemies. It has a pentagonal plan and is decorated with holes and an upper frame of brackets. Impossible not to climb on its top. In addition to the view of a splendid landscape, it will allow you to locate the last eastern section of the Gustav Line and discover the locations of the battle of the Sangro between Hitler's troops, commanded by Kesselring, and the eighth Army allied under the orders of Montgomery. Some historians claim that, during their visit to Casoli in November-December 1943, the two generals climbed the Tower to study the tactical chessboard of the armies deployed in the field. Ducal Palace The building complex of the Doge’s Palace and the Tower is commonly called “Lu Castelle” (Th’r Casle), in the dialect of Casoli, and is the pride of the community. The Tower is older than the Palace, whose construction took place in stages over the centuries by some owners. This is the constructive process over the centuries. First phase – The Orsini Princes, during the 14th and 15th centuries, built the first layout of the palace (Fig. 1) in continuity with Tower 'A' and stables 'B'. Bodies 'C', two storeys, and 'D', one storey, were built. The lower floor of the "C" area and the "D" block were used as warehouses for storing grain and other foodstuffs, while the upper one of the "C" part had a residential function. Particularly interesting is the architecture of the basement level of the body "C", which has cross vaults of bricks placed with knives, resting on brick pillars located on the two longer perimeter walls. The room is accessed through an ogival portal of worked stone. Second phase – On May 2, 1642, the D’Aquino family purchased the Castle from Francesco Filomarino, Prince of Rocca d’Aspide. The D’Aquino family had the merit, in the following two centuries, to perform important interventions to the Palace, consisting in the expansion of the pre-existing, through the construction of the "E" and "F" zones of Fig. 2. The building complex took on a closed architectural form, organized around the inner courtyard with the cistern in the center for collecting rainwater. The D’Aquinos also made changes to the "D" Body of the Palace with the construction of a basement and the raising of a roof. In the courtyard, a stepped ramp (Fig. 3), supported by two sloping round arches, was built between the 17th and 18th centuries, which still serves as a link between the courtyard and the rooms on the upper floors. Third phase – In 1916, the Masciantonio family, through Concetta Di Benedetto, (daughter of Domenicantonio di Benedetto), who had married Raffaele Masciantonio, took over the possession of the Castle. In this phase the final volumetric and aesthetic completion of the building complex took place (Figs. 4 and 5). The "E" and "F" areas were transformed into an elegant home for the family and the main facade underwent an important intervention, consisting in raising the roof through the installation of wooden trusses on newly built perimeter walls, to bring the house to a higher altitude. The crowning of the roof was embellished with a protruding decorative element, consisting of projecting brick shelves, which hold sharp arches. Fourth phase – In 1982 the Masciantonio family sold the Castle to the Municipality of Casoli, which carried out lots of renovations, improvements, consolidation and elimination of architectural barriers. The municipal administration is carrying out functional planning of the interior.