The last Great Auk to be seen in the UK was killed in 1840, so the very last one was just 4 years after. In the biggest museum in Glasgow (Kelivingrove), there's a display paying tribute to the bird. There's an electronic storybook, telling the story of the last encounter in the UK, which kids seem to love although it's very tragic. The last sighting was on an islet off St Kilda, the remotest part of the British Isles. According to the story, the men thought it was a witch and that it had caused a great storm, so they killed it.
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"We act as though comfort and luxury were the chief requirements of life, when all we need to make us really happy is something to be enthusiatic about." Charles Kingsley