2.659 of the 3.171 objects on this map have no photograph yet. Come across one, take a picture and drop it in below. That is all.
Your photo reaches us and we check that it ends up in the right place. Leave your email address and you will hear from us as soon as it is on the map. Your name is shown beside the photo, as with every other photograph on this site.
That works too, and then your photo is kept for good and anyone may use it. Upload it to Wikimedia Commons with the location attached, give it a clear name and choose a free licence such as CC BY-SA 4.0. At the next update it will appear on this map by itself.
Is a bunker in the wrong place, is one missing, or is the name wrong? The locations come from OpenStreetMap, so you can correct it there and it will change here too. Or send it through the form above and we will do it.
Many of these sites are on private land or in dunes where you may not leave the path. A photo from the path is fine. Do not enter bunkers that are not open to the public: they hold water, the concrete is loose, and bats winter in them.