Thanks.
Yes, this is a small catle, out-post of the defence line for the Vosges montains.
Built in the 16th, destroyed by the Swedishs (yes, they invaded most of Europe at this time...)
The main catle is 2 miles away, on the crest line.
Nice work. A pretty remote outpost, presumably the forest has encroached over the centuries. The rotation at 2 minutes was a little fast, I felt. But the whole video sustained my interest. Thanks for the share.