Here is a neat site which gives overviews (and a map) of some of the great travels over the past 500 years or so, from Columbus' voyage to the Lewis and Clark expedition to the counter-cultural “electric kool-aid acid trip test” of the late 1960s (granted, not all trips are of equal historical status  🙂 ).  Anyway, take a look.http://awesome.good.is/features/011/Wanderlust/index.html