One of my particular interests is in families from this area of Yorkshire who emigrated to US and Canada in the nineteenth century. Now thanks to the internet their descendants can find their roots and some come and visit.
Although, having said that, I have a wonderful collection of letters [only copies] which chronicle the story of the Thompson/Medd and other Eastrington families who emigrated to the Port Hope area of Canada in the 1820s/30s. The families kept in touch very regularly.
Recently I have been contacted by descendants of Thomas Tomlinson of Saltmarshe near Howden. He left in 1826 but never forgot his roots and passed on to his family details of where he came from. Now his descendants are coming from Canada to see where he lived.