And of course our very own BDG does Lands End to John O Groats on his Multistrada...just as a prelude to the Sahara!
That seems to be a little less adventurous than round the world, but not much less, especially when you do it without being financed by TV rights and a book deal.
It also shows that you don't need a GS to do that sort of stuff, and what a versatile bike the old Multistrada is