Watch tower overlooking the island of Es Vedra in the Southwest of Ibiza. Originally, each of these towers was within sight of the next one. In the event of an invasion or sighting of a pirate ship, the tower would light a warning fire, which could be seen by the next tower, which in turn lit its own fire, and so on, until the the entire island was aware of the danger, and was able to seek safety in the churches. A primitive but very effective early warning system.

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