Also known as lightvessels, lightships are lighthouse's little brothers, guarding areas where lighthouses are not easily built. While there are only around 15 lightships remaining today, the history of these ships stretch back hundreds of years!
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References:
Lightships | National Park Service
Lightship | Wikipedia
History of Lightships | Nantucket Historical Association
First Lightship | Guinness World Records
A History of Lightships | US Coast Guard Lightship Sailors Association International