I'll start off I guess. I have two. Without a doubt, the most exotic place I've ever had to land was Ulaanbaatar, Mongolia. Landed there in June and there was still a meter of snow on the ground. Couldn't understand the controler and ended up following their version of a follow me for over 5 miles around the airfield.
In close second it was Sultan Mohamed M Badarundi III in Sumatra. I got intercepted and damn near shot down. Once we landed my entire crew was nearly taken hostage. We paid some dude $2,500 dollars from the safe on board and were able to get some gas and get the hell out of there. Very scary! Never underestimate the power of greed, or the knowledge of english in far away places. Telling someone to "Go f#$k themself," will get you an Ak-47 in the face even if they don't speak english.