Bunker at Welfenplatz Valitse kieli Deutsch English Welfenplatz is a green oasis between the streets of Celler Straße and Am Welfenplatz. © HMTG/Falk/Heise Welfenplatz Graffitis on the bunker at Welfenplatz:The bunker at Welfenplatz is a former air-raid bunker from the Second World War. Today it is a popular graffiti hotspot and is also used to reintroduce bats into the wild.