A line of anti-tank obstacles, also known as dragon's teeth, just south-west of the B258 road, Monschauer Strasse. They are slightly below the surrounding ground level and therefore invisible from the road, but it is easy to stop on the verge here.
They are part of the Westwall or Siegfried Line fortifications - this section west and south of Aachen is called the Scharnhorst line and faces the Belgian border about 500m away.
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