Coins from Alexandria, Ostia, and Laodicea in Syria also exist. The intact Tower of Hercules at A Coruña, Spain gives insight into ancient lighthouse construction other evidence about lighthouses exists in depictions on coins and mosaics, of which many represent the lighthouse at Ostia. The most famous lighthouse structure from antiquity was the Pharos of Alexandria, Egypt, which collapsed following a series of earthquakes between 956 CE and 1323 CE. In antiquity, the lighthouse functioned more as an entrance marker to ports than as a warning signal for reefs and promontories, unlike many modern lighthouses. Since elevating the fire would improve the visibility, placing the fire on a platform became a practice that led to the development of the lighthouse. The Tower of Hercules lighthouse in northwest Spainīefore the development of clearly defined ports, mariners were guided by fires built on hilltops.
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