Danish genealogist Jacob Holdt has an interesting site that traces the roots of his family an almost unbelievable number of ancient people.
"Hitchhiking with my son, Daniel, to see Acropolis - built by Pericles - his 2nd cousin 82 times removed . Since then he has on his own hitchhiked all the way from Denmark to China to see the Great Wall which his 79th great-grandfather caused to be built.
Note: None of these relationships carry any genetic significance since we almost all descend from these famous people as I show here..."
These links show some of our trees that extend furthest back in time (wide charts - scroll horizontally):
Charlemagne 742 - 814
Gabhran Macdomangairt (500 - 599)