The fortress of Ulm was one of the largest fortifications of Europe in the 19th century. After the departure of Napoleon's army of the German Union, it was decided the construction of several fortresses in the country to strengthen the security of the German lands.

The Gothic fortress was erected from 1838 to 1859 North of the city under the direction of architect Moritz Karl Ernst von Prittwitz. It's pretty typical for those times, the construction is a polygon with a total length of walls more than 9 km. Inside, there are high-rise buildings of the barracks can accommodate 5 thousand soldiers in peacetime and to 20 thousand military. Weapons of the defenders of the fortress were installed both on walls and on the roofs of barracks. In the wall there were 6 gates and 2 railway tunnels. At some distance from the fortress on the South side of Ulm was equipped with a few well fortified FORTS. They are designed to protect the town against direct attack. Strategically the most important object is the only bridge over the Danube — were inside the fortress. There were plans for further expansion Ulm fortress, but they were not implemented. Yes, and the appointment of the Gothic fortress was never used.

During the Second world war, the fortifications were partly destroyed, and the remnants continued to collapse within a few decades after. Recently the society of enthusiastic researchers Ulm fortress was partially restored.