Frozen Lighthouse, Lake Erie, North America

History
Ancient
Perhaps the most famous lighthouse in history is the Lighthouse of Alexandria, built on the island of Pharos in Hellenistic Egypt. The name Pharos is still used as the noun for "lighthouse" in some languages, for example: Albanian, Catalan and Romanian (far), French (phare), Italian, Galician and Spanish (faro), Portuguese (farol), Danish, Norwegian and Swedish (fyr), Bulgarian (фар), and Greek (φάρος). The term "pharology" (study of lighthouses) also derives from the island's name.
The Lighthouse of Alexandria was built in 280 BC to serve as the port's landmark. With a height variously estimated between 115 and 135 meters (383 - 440 ft) it was among the tallest man-made structures on Earth for many centuries, and was identified as one of the Seven Wonders of the World by classical writers. Two lighthouses, each called the Pharos, were built at Dover soon after the Roman conquest of Britain. They were sited on the two heights (Eastern Heights and Western Heights) and modeled on the one built for Caligula's aborted invasion at Boulogne.