Walls of Thessaloniki

Put your palm flat against the wall. The stone is rough and uneven, and every so often your fingers cross a smooth, flat band of red brick. Up here in the upper town, the air is quieter than the waterfront below. A cat watches from a ledge. Somewhere a scooter climbs a steep lane. And in front of you, a wall that has stood for well over a thousand years simply carries on, as if nothing much has happened.

These are the Walls of Thessaloniki. Today they rise and fall across the hillside of Ano Poli, the old upper town, and climb toward the citadel at the top. Once, they wrapped the entire city in a single loop of stone. They ran down from the hills, along both sides of the city, and right along the edge of the sea. What you see now is the part that survived — the land walls, mostly on the high ground.

The story of these walls begins with the city itself. Thessaloniki was founded in 315 BCE by Cassander, a Macedonian king. He named it after his wife, Thessalonike, who was a half-sister of Alexander the Great. The earliest defences were Hellenistic, which means they belong to the Greek world shaped by Alexander and his successors. Very little of that first wall is visible today. It lies buried under later layers, like the bottom page of a thick book.

Most of the wall in front of you is Roman and Byzantine. The great rebuilding came in the late fourth century, when Thessaloniki was one of the most important cities of the eastern Roman Empire. That eastern empire, ruled from Constantinople, is what we now call Byzantium. For centuries afterward, emperors and governors repaired, thickened and extended these defences. So the wall is not one building. It is many generations of work stacked on top of each other.

Look again at those bands of brick. Builders laid courses of stone, then several rows of flat brick, then stone again. This method was common across the Byzantine world. The brick levelled each layer and helped bind the wall together. Up close, you can also see patches where the pattern breaks — rougher stone, different mortar, odd angles. Each patch is a repair. Some were made after an attack. Others were simply the slow work of keeping a city safe.

Here is something many visitors miss. Some of the bricks form shapes and letters. Here and there, builders set brick into crosses, zigzags and short inscriptions. Some inscriptions name the people who paid for or ordered the work. Most passers-by never notice them. If you walk slowly and scan the wall at eye level and just above, you may spot a pattern that is clearly decoration, not structure. It is a small signature from a person who stood where you stand.

These walls were tested many times. In 904, Arab raiders led by Leo of Tripoli broke into the city from the sea and carried away thousands of captives. In 1185, Normans from southern Italy and Sicily took and sacked Thessaloniki. In 1430, the Ottoman army of Sultan Murad the Second captured the city after a siege. Each time, the walls failed at some point — and each time, the city rebuilt them.

At the very top of the old town sits the citadel, known by its Greek name, Heptapyrgion, which means seven towers. Under Ottoman rule it was called Yedi Kule, with the same meaning in Turkish. Later, the fortress became a prison, and it remained one until 1989. Greek songs of the early twentieth century, called rebetiko, mention Yedi Kule as a place of hard confinement. Today the complex is open as a monument, and its courtyards feel calm and wide.

A little further along, at the northeastern corner of the upper town, stands a large round tower called the Trigonion. It is one of the most visited points on the wall, and for good reason. From the area around it, the whole city opens out below you. You can follow the grid of streets down to the bay. On a clear day, the shape of Mount Olympus can sometimes appear across the water to the southwest.

Now think about the sea walls that are no longer there. In the late nineteenth century, the Ottoman authorities pulled down the walls along the waterfront so the city could grow and breathe. Only one great tower by the water was left standing. You probably know it already. It is the White Tower, now the symbol of the city. So when you look at the White Tower, you are looking at a lone survivor of a much longer line of stone.

In 1988, a group of early Christian and Byzantine monuments in Thessaloniki was added to the UNESCO World Heritage List. The walls are part of that group, alongside churches such as the Rotunda and the Church of Saint Demetrius. UNESCO is the United Nations body that protects places of shared human value. That listing helps explain the scaffolding and fresh mortar you may see in some sections. Conservation here is ongoing, careful, and slow.

What makes these walls special is how ordinary they feel today. Houses lean against them. Laundry dries a few metres from Byzantine brick. Children kick a ball through a gap that once let soldiers pass. In many cities, old walls sit behind fences. Here, people simply live beside them. The wall is a backdrop to breakfast, to gossip on a doorstep, to the evening walk home.

If you have time, follow the wall downhill on foot rather than taking a taxi. The lanes of Ano Poli twist between low houses, small churches and old wooden balconies. The upper town survived the great fire of 1917, which destroyed much of the lower city. That is why this neighbourhood still feels older and more uneven than the streets near the sea. The wall is your guide. Keep it on one side, and you will find your way.

Before you move on, rest your hand on the stone once more. Feel the change from rough stone to smooth brick. Listen for the scooters, the birds, the faint sound of the city below. People have defended this line, broken through it, repaired it, and built their homes against it. Now it holds only the afternoon light. As you walk away, glance back once. The wall will still be there, doing what it has done for centuries — quietly standing.