I have used the free service offered through the LDS church and have been able to search back to the 1350s on one line, most into the early 1600s, and a few into the 1400s. It is interesting to see the names and dates of ancestors, but more so to find old stories about who they were (usually people from the 1600-1800s). Lots of people have compiled info over the years, which is now fairly easy to access on the Web. Be careful though, you might end up finding you are related to sketchy individuals such as JB, BO, or BT.....