Hartmannswillerkopf, also known as the Vieil Armand or Hartmannsweilerkopf is a pyramidal rocky spur in the Vosges mountains. The peak stands at 956 meters overlooking the plain of Alsace. At Hartmannswillerkopf stands a national monument of World War I for the fighting which took place in the trenches here. Today, the area is a French national monument. There is a museum and a cemetery at the site, and it is also possible to explore the extensive trench system. Because the lines were static for such a long period, the trenches are very well preserved, especially on the German side of the mountain.