You've got the more organised stuff like Himalayas and probably plenty of other places.
Doesn't stop you simply buying a bike / renting one / shipping your own to a country and going exploring.
I shipped my BMW to USA (LA) and then spent 6-7 weeks touring the western states and a little of Canada, not much off road back then (hadn't really started adv riding) but groups over there are also building back country discovery routes (BDR) for each state plus others like TAT and CDR.
When you're keen, probably pop over to AdvRider (
http://advrider.com/index.php) which has specific regional forums for as much detailed advice from locals as you could probably get.
Still on my bucket list is doing the Dalton and Dempster highways to the top of the USA and Canada, but I'd rather wait until a year-round highway extension is built to Tuktoyaktuk in Canada (under construction currently).
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