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Tŵr Mawr lighthouse (meaning "great tower" in Welsh), on Ynys Llanddwyn on Anglesey, Wales, marks the western entrance to the Menai Strait. The 1873 tower is tapered in a style characteristic of Anglesey windmills. It is 33 feet (10 m) high and 18 feet (5.5 m) in diameter. It may have been constructed by an Anglesey stone mason, and it is possible that the tower itself was originally used as a windmill.