Fort VII, Poznań

The first thing you notice is the cold. Even on a warm afternoon, the air inside these brick tunnels stays damp and still. It smells of wet stone and old earth. Your footsteps echo off curved ceilings, and the light from the entrance fades quickly behind you. This is Fort VII, on the western edge of Poznań. What looks from outside like a grassy mound hides one of the darkest chapters in the history of this region.

To understand why this place exists, we start in the nineteenth century. Poznań was then part of Prussia, and the Prussian army turned the city into a major fortress. In the second half of that century, engineers built a ring of detached forts around the city. Each one sat at a distance from the centre, so it could hold off an enemy long before the enemy reached the streets. Fort VII was one link in that defensive chain.

Look at how the fort is built. It is low, not tall. The brick structures are covered with thick layers of soil and grass. That was deliberate. By the late nineteenth century, artillery had become far more powerful, and high walls were easy targets. Engineers buried the fort into the landscape instead. A dry moat runs around it, and the casemates, which are vaulted brick rooms for soldiers and supplies, sit protected under the earth.

In military terms, the fort aged quickly. Weapons changed faster than fortresses could. After the First World War, Poznań became part of a reborn Poland, and the old Prussian forts found new, quieter uses, often as storage. For a time, Fort VII was simply an outdated piece of military architecture. Then, in 1939, everything changed.

In September 1939, Germany invaded Poland. Within weeks, the occupying authorities turned Fort VII into a camp. It was one of the first camps of its kind on occupied Polish territory. Historians describe it as a concentration camp in its early phase, and later as a police prison and transit camp run under the security police and the Gestapo. The damp tunnels you are walking through became cells.

The people held here came mostly from the Wielkopolska region, the historic area around Poznań. Many were members of the Polish elite: teachers, priests, lawyers, officials, activists, and veterans of earlier Polish independence struggles. The occupiers wanted to remove anyone who might lead resistance. Later, members of the underground resistance were brought here too. Some stayed for days. Others stayed for months before transfer to larger camps, or before execution.

Now comes a fact that many visitors do not know, and it is hard to hear. In the autumn of 1939, in one of the bunkers of this fort, the German authorities murdered patients from a nearby psychiatric hospital using poison gas. Historians regard this as one of the earliest uses of a gas chamber by the Nazi regime. In other words, a method that later became part of the Holocaust was tested here, in a small brick room in Poznań, very early in the war.

Conditions in the fort were brutal. The cells were overcrowded and cold. Water ran down the walls. Prisoners slept on straw or on the bare floor. They had little food and almost no light. Guards used beatings, punishment drills and humiliation every day. The exact number of people who died here is still uncertain, but historians estimate that several thousand prisoners lost their lives inside these walls. Many more passed through on the way to other camps.

As you walk, pay attention to the scale of the rooms. They are not large. Try to imagine dozens of people pressed into a space like this, in winter, with no heating. The museum keeps many of the rooms almost bare on purpose. The bare walls and the silence do much of the work. Some cells hold reconstructed details, and others display documents, photographs and personal objects that belonged to prisoners.

Today the site is a museum of martyrdom. It is dedicated to the people of Wielkopolska who suffered under the occupation. It opened to the public in the late twentieth century, and it remains a place of memory as much as a museum. You will often see flowers, candles and small flags left near the memorials. Families still come here to remember relatives who were held in these cells.

There is a second surprise here, a quieter one. The original military design of the fort shaped the experience of prisoners. The earth cover that once protected soldiers from shells also kept out sunlight and warmth. The thick walls that stopped enemy fire also stopped any sound from reaching the outside world. A building made for defence became, without any change to its structure, a place of isolation. The architecture did not need to change. Only its purpose did.

Outside, take a moment by the memorial. The contrast is striking. Trees grow over the earthworks, birds move through the grass, and the noise of a modern city carries from the roads nearby. Poznań has grown up around the fort. Homes, shops and busy streets now surround a place that once sat at the far edge of the city.

As you leave, notice the change in the air as you step out of the tunnel. The warmth returns, and so does the light. For the prisoners who passed through here, that small step outside was not always possible. Walk back slowly. Look once more at the low green mound behind you, and remember that what looks like a quiet hill holds the memory of thousands of lives.