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Abandoned submarine base in Greece.
(sh.itjust.works)
Desire paths Desire paths can be paths created as a consequence of erosion caused by human or animal foot-fall or traffic. The paths usually represent the shortest or most easily navigated routes between origins and destinations. https://en.wikipedia.org/wiki/Desire_path
I bet that was used as a filming location multiple times. What's the name of the place?
There are many such places in the world.