Update 2: added a new map post here in my ongoing series of revisiting here
Update 1: added at bottom a new map adding to an existing Antarctic project
Pyrénées
When visiting the nearby village of Pontacq (Flickr & village site), the glorious sunshine showed the Pic do Midi de Bigorre (Wikipedia) so clearly we could see the observatory atop! It's the left peak in the central massif below.