Neuschweinstein in Bavaria, Germany.
It makes even less sense, since there's a thing called "Panoramafreiheit" in Germany.
If they wish to apply strict rules, they should at least know them.
Just looking at wikipedia for "freedom of panorama" they have this "Many laws have subtle differences in regard to public space and private property. Whereas the photographer's location is irrelevant in Austria, in Germany the permission applies only if the image was taken from public ground, and without any further utilities such as ladders, lifting platforms, airplanes etc. Under certain circumstances, the scope of the permission is also extended to actually private grounds, e.g. to publicly accessible private parks and castles without entrance control, however with the restriction that the owner may then demand a fee for commercial use of the images."
Not to take wikipedia as the end but it seems to specifically say that these types of images can be limited in Germany if they were taken on private property. My guess is that IS was threatened with a lawsuit and that is why they took down the images.