Lighthouse - Wikipedia
https://en.wikipedia.org/wiki/Lighthouse
OverviewHistoryTechnologyBuildingMaintenancePreservationSee alsoExternal linksA lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lenses and to serve as a beacon for navigational aid, for maritime pilots at sea or on inland waterways. Lighthouses mark dangerous coastlines, hazardous shoals, reefs, rocks, and safe entries to harbors; they also assist in aerial navigation. Once widely used…
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