The Blockhaus d'Éperlecques, also known as the Watten bunker, is a massive Second World War bunker located near Saint-Omer in the Pas-de-Calais département of northern France. This concrete fortress was constructed by Nazi Germany as part of their V-weapon program, intended to launch V-2 rockets against Allied targets. The structure represents one of the most ambitious bunker projects of the war, designed to house and launch ballistic missiles from occupied France.
Today, the site operates as a museum and historical center, preserving this significant relic of Europe's wartime heritage.