The Blockhaus d’Éperlecques was a giant bunker built by Nazi Germany between March 1943 and July 1944 and was originally intended to be a launching facility for the V2 ballistic missile.
It was designed to accommodate over one hundred missiles at a time and to launch up to thirty-six a day all destined to land and explode on London and the South-East of England. The facility was designed to incorporate a liquid oxygen factory and a bomb-proof train station to allow missiles and supplies to be delivered from production facilities in Germany.
Have Bag, Will Travel 
We have several nearby me now, and a complex full of them with turret guns as well right in Quiberon peninsula part of the Atlantic Wall. Interesting places even if agree very sad.
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Sad but worth preservation. Perhaps it will remind us not to do it again?
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That is the hope.
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I recall visiting this place over a decade ago….sobering
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An extraordinary monument to the war Sue!
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And of man’s inhumanity to man at Dora Mittelbau etc
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Very imposing.
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