On the extreme western edge of Berlin, after six years of construction in 1888 Fort Hahneberg was completed. It was the last newly built fortress in Germany. To protect the Spandau centre of arms, after the German-French War 1870-1871 a belt of four forts around the city were planned. However only one was realized, since the development of artillery projectiles, especially the introduction of explosive grenades, meanwhile made this type of defensive fortress ineffective. Since 1993, it is cared for by the " Arbeits- und Schutzgemeinschaft Fort Hahneberg e.V." which offers regular tours.