Some of the watch towers lining the coast of Ibiza can still be seen today. 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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