Georgios86 / CC-BY-SA-3.0

Yiannis Katsoyiannis / CC BY-SA 2.0

Αννίτα Μπάνου / cc-by-sa-4.0

Julian Nyča / cc-by-sa-3.0

Luc.T from Buggenhout, België / cc-by-2.0

Αννίτα Μπάνου / cc-by-sa-4.0

Julian Nyča / cc-by-sa-3.0

Sharon Hahn Darlin / cc-by-2.0

Jean Housen / cc-by-sa-4.0

Armineaghayan / cc-by-sa-4.0

G.Garitan / cc-by-sa-4.0

The Byzantine Walls are a historic archaeological fortification system surrounding the old city, exemplifying Byzantine military architecture. They date back to the medieval period and reflect the city's ancient defenses, highlighting the strategic importance of Thessaloniki during Byzantine times. As part of a UNESCO World Heritage Site, the walls serve as a significant cultural monument illustrating the architectural and historical heritage of the Byzantine era.