When we got the car - a fearsome Citroen Berlingo - we made our way towards the north end of Cap Corse, and were quickly winding along mostly undeveloped coast, with little villages above on the treed slopes, and almost no one on the roads. And that's the way it would stay for our entire trip around the north half of the island - relentlessly curvy roads, large areas of wild maquis scrubland, forest and alpine, scattered ancient villages, and more pigs and goats than cars on the roads. We hiked for over three hours around a nature reserve and several beaches the next morning, following the Sentier des Douaniers on the north end of the island, and saw precisely 0 other people. This guard tower is one of a series that ring the island. They were built to warn of pirate attacks, apparently the bane of Corsicans for several centuries. The watchmen lit a fire on the tower when pirates sailed over the horizon, and the signal was taken up by adjacent towers, spreading the message around the whole island in a couple of hours. It was the Twitter of its time.