The Byzantine walls of Thessaloniki are today about 4 km long, but the original perimeter they covered was 8 km and their height was 10-12 meters.
The wall surrounded the city for many centuries, including on the southwest side towards Thermaic Gulf, but it no longer exists today. On the northeastern side, it rises to the hills, including the citadel where the defensive complex of Eptapyrgio is located.
In the western and eastern walls there are triangular cantilevers, while in the higher points and especially in the part that separates the citadel from the city, there are rectangular towers. Their construction includes repeated rows of bricks and stones decorated with Christian (crosses) and ancient Greek symbols (representations of the sun, rhombuses). The Byzantine walls, which are preserved in Constantinople, have a similar style.
Today they are a special and remarkable monument of Thessaloniki as well as one of its landmarks, while they have been officially declared a World Heritage Site by UNESCO.
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