In reply to Bruce Hooker:
> On a micro level, exploring caves, canyons and such like possibly but in terms of finding new lands, the source of the Nile and so on, hasn't it all been explored already?
It depends if you see exploration as discovering new places, setting out into the unknown or whether being an 'explorer' is something that a person is?
Robert Twigger talks quite intelligently about this in his book, which details his attempts to paddle to the Pacific in a birch bark canoe.