Strongpoint Douvres Distelfink I was a large radar facility south west of the village of Douvres-la-Delivrande behind Juno and Sword landing beach areas.
It was an early-warning radar site which covered the area of the Bay of the Seine towards Le Havre and featured two radar types, a L486 radar generator and crew bunker, a L479 bunker for 'Anton' night fighter control systems, two R622 personnel shelters, a workshop, searchlight emplacement, and a trio of anti-aircraft gun positions.
Distelfink I site is now a superb museum and you get to walk around the site and go inside one of the R622 shelters and L479 bunker where there are lots of informative displays on radars from the era to the modern day.
Perhaps the stand out item at the museum tough is the Wurzburg Riese radar which is on display - one of the few remining of its type left in the world. The 24ft wide radar dish has currently been detached from it's mounting and rear operators cabin and is undergoing restoration but you can see how the whole system attaches to a tiny concrete base.