Fortress of Justinian or simply known as Tirana Castle dates is a remnant from the Byzantine-era. The preserved ruins show that the castle was probably founded in antiquity, maybe in the Early Byzantinum (400-600 AD). The fortress is the place where the main east-west and north-south roads crossed, and formed the heart of Tirana. The current fortification has three known towers and it is undergoing a process of restoration, for touristic purposes. Inside the fortified walls of the former fortress, there are many buildings that can be visited, including restaurants, hotels, and cultural institutions.
About all that is left of the fortress above ground is a 6-metre high Ottoman-era wall, covered in vines. The recently uncovered wall foundations were incorporated into the pedestrianised Murat Toptani Street, while a mosaic commemorating the 100th Anniversary of Albania's Independence was unveiled near the Albanian Parliament.
References:Ehrenbreitstein Fortress was built as the backbone of the regional fortification system, Festung Koblenz, by Prussia between 1817 and 1832 and guarded the middle Rhine region, an area that had been invaded by French troops repeatedly before. The fortress was never attacked.
Early fortifications at the site can be dated back to about 1000 BC. At about AD 1000 Ehrenbert erected a castle. The Archbishops of Trier expanded it with a supporting castle Burg Helferstein and guarded the Holy Tunic in it from 1657 to 1794. Successive Archbishops used the castle's strategic importance to barter between contending powers; thus in 1672 at the outset of war between France and Germany the Archbishop refused requests both from the envoys of Louis XIV and from Brandenburg's Ambassador, Christoph Caspar von Blumenthal, to permit the passage of troops across the Rhine.