I was big into genealogy for a while. I spent quite a bit of time at the State Historical Building going through dozens and dozens of microfiche and microfilm. It was awesome. Then I spent some time at the National Archives too, which was cool, finding which ship my ancestors came over on. I lost a bit of interest when I tried finding my great grandparents and beyond in Germany and Austria.
One of the fun things was finding that my grandfather spelled his name one way when he came to the U.S., while one of his brothers spelled his last name differently when he came over, and another two brothers spelled theirs differently still! The German Ö had two brothers using "oeh", another "ah", and another using "oh". The brothers all arrived at different times, and a couple through different ports, so their Americanized names were spelled by whomever processed them. Turns out I had played sports against kids from neighboring schools in Iowa who were direct relatives and I had no idea.