score:9
This looks like one of the Genoese towers, of which 67 still stand today. They are somewhat similar-looking and all are on the seacoast, so it may be a bit difficult to identify this particular tower without a doubt. You can compare the map of surviving towers with the route followed by the Tour βΒ that only eliminates about half of them.
Tour de la Parata in Ajaccio looks very similar, so I guess that's the one. It's also one of the most famous ones. It's a local tourist attraction.