Arcola is a small, charming town perched on top of the hills separating the Gulf of La Spezia and the Magra valley offering stunning panoramas of the Apuane Alps. In the 11th century Arcola became an important center for the feudal Obertenghi family who built on top of the hill a castle - Castello degli Obertenghi, of which only its tall pentagonal tower remains.
The castle itself had a rich history and had an important naval function in the western Marca Ligure. In 1128 the castle became the property of the monastery of San Venerio del Tino. During the thirteenth century the town was the center of the various attempts of the family domain Malaspina and the castle was besieged and captured by Captain Oberto Doria, Captain of the Republic of Genoa. Various events then led to the occupation of the castle by Castruccio Castracani (1320), and after by Niccolò Piccinino (1430). In 1494, the castle was return to the possession of the Genovese Repiblic. Partially destroyed during the Italian campaign of Napoleon, the castle was restored in 1884 by Eng. Canini and became the home to the town hall.
The imposing pentagonal tower built adjacent to the castle is hard to miss in the landscape of the town. Nowadays, it has been declared a national monument and is opened to visitors. It stands at 25 meters high with a perimeter of the same size. The tower was the focal point of the defence system of the castle. It was purposefully built in the most vulnerable to attack part. Positioned as a bastion on one side it had its corner stretched menacingly in the direction of possible attackers coming from porta Sovrana while on the other it was equipped with embrasures, affording the ability to defend the two side entrances.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.