This place is located in the West of Poland.
Have a look at the German fortifications in the West of Poland – the Camp earthworm.
This massive concrete structure was erected in the second half of the 30-ies of XX century to protect the Eastern borders of Germany.
An extensive network of underground tunnels with numerous Pillboxes, retractable artillery, flame throwers and personnel 35 000 people had to stop the enemies of the Third Reich, but those plans went awry.
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