loulan says [Source.](https://www.flickr.com/photos/158696912@N02/30195000087/in/album-72157695862102801/)
torsmork says [About Bastion forts a.k.a star forts.](https://en.wikipedia.org/wiki/Bastion_fort) [ A list of star forts.](https://en.wikipedia.org/wiki/List_of_star_forts) [About Neuf-Brisach.](https://en.wikipedia.org/wiki/Neuf-Brisach)
loulan says
[Source.](https://www.flickr.com/photos/158696912@N02/30195000087/in/album-72157695862102801/)
wisi_eu says
https://fr.wikipedia.org/wiki/Neuf-Brisach
OrigatoSon says
But why? And where is the keep, if there was one?
torsmork says
[About Bastion forts a.k.a star forts.](https://en.wikipedia.org/wiki/Bastion_fort)
[
A list of star forts.](https://en.wikipedia.org/wiki/List_of_star_forts)
[About Neuf-Brisach.](https://en.wikipedia.org/wiki/Neuf-Brisach)