The Mount Ursino Castle was destroyed by a fire around 900 and rebuilt on the hill. It is mentioned in 1004 in a document and defined fortified village. After the construction of a first tower on top of the hill, the fortress was enlarged repeatedly until reaching its present form around the 15th century, embracing even the baby village in the Piana, current historical center, while it was gradually abandoned that in hill. Supporters of this structure medieval military were mainly the Del Carretto family, the feudal lords of Noli. The castle was able to control both the sea and the coast that the old Roman road passing in the hill in the locality of Voze, and used until the 18th century.
The castle is formed on the top by a cylindrical tower, surrounded by massive walls and from the accommodation for the troop. From this main core descended two walled perimeters, largely still preserved today, which embraced the whole hill and subsequently also the village downstream. Circular towers susseguivano it at regular intervals along the sloping walls on the sides of the Monte Ursino. The access doors were defended by a singular system still today partly preserved that was constituted by an external tower to walls and connected thereto via a walkway in masonry. This allowed to defend the access doors from the outside by hitting enemies from behind. The castle and the walls of the village are among the examples of medieval fortification best preserved in the Ligurian Ponente.References:
The Petersberg Citadel is one of the largest extant early-modern citadels in Europe and covers the whole north-western part of the Erfurt city centre. It was built after 1665 on Petersberg hill and was in military use until 1963. It dates from a time when Erfurt was ruled by the Electors of Mainz and is a unique example of the European style of fortress construction. Beneath the citadel is an underground maze of passageways that can be visited on guided tours organised by Erfurt Tourist Office.
The citadel was originally built on the site of a medieval Benedictine Monastery and the earliest parts of the complex date from the 12th century. Erfurt has also been ruled by Sweden, Prussia, Napoleon, the German Empire, the Nazis, and post-World War II Soviet occupying forces, and it was part of the German Democratic Republic (East Germany). All of these regimes used Petersberg Citadel and had an influence on its development. The baroque fortress was in military use until 1963. Since German reunification in 1990, the citadel has undergone significant restoration and it is now open to the public as a historic site.