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A tower or other structure containing a beacon light to warn or guide ships at sea.
A tower or other structure displaying or flashing a very bright light for the guidance of ships in avoiding dangerous area, in following certain routes, etc.
A structure (as a tower) with a powerful light that gives a continous or intermittent signal to navigators.
A lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses or, in older times, from a fire, and used as an aid to navigation for maritime pilots at sea or on inland waterways.
Lighthouses mark dangerous coastlines, hazardous shoals, reefs, safe entries to harbors, and can also assist in aerial navigation. Once widely used, the number of operational lighthouses has declined due to the expense of maintenance and replacement by modern electronic navigational devices.