The Fort l'Écluse is close to the village of  Collonges, Ain in Eastern France. It commands the Rhone valley and is a  natural entrance into France from Switzerland between the Vuache hills  and the Jura Mountains.

Very nice footage

Excellent footage!   

Good work

That is one awesome chateau-fort. You must have put in quite a bit of leg-work to view the interior. Thanks for the share.

Really interesting place!  It's great that you can still get into it, thanks for the tour.  Very nice...

Great video, it's really interesting, enjoy it. Thanks for sharing.

Aloha Alexey,

     That was an amazing place.  Good documentation.  So good I had to Google Earth it!

Aloha and Drone On!