fact
The Flannan Isles Lighthouse is known for the mysterious disappearances of its keepers in 1900. The entrance gate to the compound and the main door were both closed, beds were unmade, and the clock was stopped. The set of oilskins found suggested one of the keepers had left without the others.
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Lighthouse keepers constantly went nuts due to mercury poisoning from the fresnel lens lamps they used combined with isolation. It was a major issue for the USCG until a doctor took a look at the huge pool of mercury sitting under the lens.
The Stannard Rock Light, known as the “Loneliest Place in the World”, is the furthest lighthouse from land and described as one of the top ten engineering feats in the United States.