V2 WWII Bunker - La Coupole - The Dome on Flickr.
Took a trip over to France to explore some WWII bunkers.
Last stop was La Coupole another V2 rocket factory. This was set high on a hill in the shape of a big concrete dome.
The factory also had miles of underground tunnels going through the countryside. The dome is now a museum and a place of remembrance.