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Lighthouse, tower with a light at its head, erected on or near a coast or on a rock in the sea, as a warning to ships. One of the earliest lighthouses was on the Pharos peninsula in 3rd-century B.C. Alexandria, considered one of the 7 wonders of the world. In modern lighthouses, the lantern usually consists of a massive electric light with an elaborate optical system producing intense beams.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Lange, Dorothea to Lilac