Why lighthouses ?

Left : Alexandria lighthouse, according to J-C Golvin, CNRS Architect - Right : Ouessant Buoy ct -
(Photo : Cetmef Asco-TP)
From Pharos, the first lighthouse built at Alexandria around 280 BC, to the buoy marking the entrance to the marine rail at Ouessant, Man has felt it essential to provide assistance to navigation and to sailors.
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