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 in the US today, the history of these ships stretch back hundreds of years!

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References:

1. Lightships | National Park Service
2. Lightship | Wikipedia
3. History of Lightships | Nantucket Historical Association
4. First Lightship | Guinness World Records
5. A History of Lightships | US Coast Guard Lightship Sailors Association International