Nantucket Cliff Lights
Encyclopedia
The Nantucket Cliff Lights, also known as the Nantucket Cliff Range Lights were a set of range lights
Leading lights
Leading lights are a pair of light beacons, used in navigation to indicate a safe passage for vessels entering a shallow or dangerous channel; and may also be used for position fixing. At night, the lights are a form of leading line that can be used for safe navigation...

 on Nantucket. Over the years, there were several sets of range lights to lead ships into Nantucket Harbor. The first, pictured here, were built in 1838. The second, a pair of conical white towers which still exist, although not on the same site, were discontinued in 1912.
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