Lighthouse
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A 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
Roter Sand Lighthouse in the Weser estuary, Germany, facing the North Sea
Barnegat Lighthouse at the coast of Ocean County, New Jersey, U.S., facing the Atlantic Ocean at sunrise
The Tower of Hercules lighthouse in north-western Spain
Original Winstanley lighthouse, Eddystone Rock, by Jaaziell Johnston, 1813.
Sea mark
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A sea mark, also seamark and navigation mark, is a form of aid to navigation and pilotage that identifies the approximate position of a maritime channel, hazard, or administrative area to allow boats,
The Ketch Popoff, approaching Concarneau harbour and passing between the sea mark buoys of the entrance, while an approaching trawler in the background sails around the red buoy
Inland sea mark on Ashey Down, Isle of Wight, built in 1735 and now a historical monument
Red buoy in San Diego Harbor, with a light, number, and radar corner reflectors.
Green can #11 near the mouth of the Saugatuck River.