The Abspann-Anker bunker is a German-built splinter-proof shelter located in Ketrzyn, Poland. Constructed in 1942 during World War II when the town was known as Rastenburg and part of German territory, this bunker served as an air raid shelter designed to protect against bombing raids. The structure represents the extensive German military fortifications built in the region during the war.
Today, it stands as a historical remnant of the area's wartime past and the shifting borders of Eastern Europe.