The tower is often referred to as the Chain Tower due to a decorative ring of stone relief that encircles its exterior.
Its strategic placement was specifically chosen to defend the point where the city walls faced the steepest approach from the north.
During the Ottoman period, the tower served as an ammunition storage facility and an artillery platform.
It is integrated into the remaining segment of the Byzantine-era wall system that once enclosed the entire city.
The tower's architecture features a distinct lack of heavy ornamentation, prioritizing defensive structural integrity over aesthetic display.
Excavations in the vicinity have revealed layers of occupation dating back to the Roman period.
Trigonion Tower, also known as the Chain Tower (Alikiou Tower), is a 15th-century fortification located at the northernmost point of the Byzantine walls in Thessaloniki. It served as a vital part of the city’s defense system, protecting the vulnerable northern approach near the Upper Town (Ano Poli). The structure is characterized by its cylindrical shape and robust masonry, designed to withstand heavy artillery fire. Today, it stands as an observation point providing panoramic views over the city, the Thermaic Gulf, and the surrounding residential districts. The tower is situated along the historic city wall route that connects the Acropolis of Thessaloniki to the harbor. Visitors can walk along sections of the wall adjacent to the tower to observe the transition between Ottoman and Byzantine architectural styles.
From the exterior base of the tower looking down toward the sea, capturing the contrast between the stone wall and the modern city sprawl.
Bring a pair of binoculars to better view the intricate stonework details of the surrounding city walls.
Wear comfortable, sturdy walking shoes, as the paths along the walls consist of uneven stone and gravel.
Plan to continue your walk along the wall toward the Vlatadon Monastery to see more preserved sections of the Byzantine fortifications.
Attempting to climb on the loose or crumbling masonry of the older wall sections, as these areas are unstable and restricted.
