Yes, it was a French Foreign Legion site. Easy access from the main road to the south, interesting lands to the east and north, but they were heavily flooded when I was there, so I couldn't explore more.
The entrance wall shown in the film is clearly defensive with another set of walls at the northern high backside to protect that way in. Then there's another wall across which was to collect rain water.
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"For sheer delight there is nothing like altitude; it gives one the thrill of adventure
and enlarges the world in which you live," Irving Mather (1892-1966)
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