Where in the world...

I know some fun and challenging places to fly that I have found by accident. I would like to know other peoples unique places that they keep returning to just because they are special or exceptionally well done.
One of mine is a nice add-on called 2nd Aviation Group Advanced Training Base at Ravalli County Airport (ID 6S5) Montana with scenery by L B Martin. Has helo training facilities, landing pads, a low level training path, mountain SAR figures, and beautiful scenery all around. So post your spots here to share the fun.