Although known as the 'Fortress of Seven Towers,' the layout consists of ten distinct towers, five on the northern side and five on the southern side.
The interior contains cells and administrative buildings from its 100-year history as a notorious prison, which have been partially preserved to show the transition from fortress to correctional facility.
The prison was the setting for many notable Greek 'rebetiko' songs, which often referenced the confinement experienced within its walls.
The site was officially closed as a prison in 1989, after which it was transferred to the jurisdiction of the Archaeological Service.
The western part of the fortress incorporates sections of the older Acropolis walls, dating back to the late 4th century BC.
The Heptapyrgion, also known as Yedi Kule, is a Byzantine-era fortress situated on the northernmost point of the Thessaloniki city walls. Despite its name meaning 'Seven Towers,' the structure actually incorporates ten towers within its complex. It served as a military citadel during the Byzantine period and later functioned as the city's primary prison from the late 19th century until 1989. The architecture represents a layered history, combining original Byzantine foundations with Ottoman-era reinforcements and later prison modifications. Today, it stands as a protected archaeological site managed by the Greek Ministry of Culture. The complex offers expansive views overlooking the entire city of Thessaloniki and the Thermaic Gulf.
The southern rampart walls provide an unobstructed panoramic view of the Thessaloniki skyline and the sea.
Wear sturdy walking shoes, as the internal paths are uneven, rocky, and often unpaved.
Bring a light jacket even in summer, as the elevated position creates wind exposure.
Visit the surrounding Ano Poli (Upper Town) neighborhood immediately after to see the traditional Ottoman-era residential architecture.
Attempting to climb or scale the unrestored sections of the outer walls, as the masonry is fragile and uneven.
Closed on Tuesdays.
