As you can read on http://en.wikipedia.org/wiki/Rocket_experiments_in_the_area_of_Cuxhaven, on http://www.astronautix.com/sites/cuxhaven.htm and in German on http://www.raketen-modellbau-technik.de/geschichte/cuxhaven/bericht.htm between 1933 and 1964 several remarkable rocketexperiments took place in the area of Cuxhaven. The best known of these was the such called "Operation Backfire" ( http://en.wikipedia.org/wiki/Operation_Backfire ), the demonstration of V2 launches to allied troups. For this a launchpad was built, from which still a few remanents can be found

http://www.modellraketenbau.de/countdown/images/karte.gif
Map of the area

http://www.modellraketenbau.de/countdown/images/bmulde.jpg
Here was the launchpad

http://www.modellraketenbau.de/countdown/images/bbrocken.jpg
Piece of concrete remaining

http://www.raketen-modellbau-technik.de/geschichte/cuxhaven/wpe7.jpg
Remanents of shelter

http://www.raketen-modellbau-technik.de/geschichte/cuxhaven/wpe8.jpg
Former Cable hole