I think Tunisia has been visited in TAR1 already? They did 2 legs there~
In my opinion, I would like to see TAR visits 1 or 2 new countries each season, but it would be better if they can really show some culture of those places. Take Bangladesh as an example, last time the visit of Dhaka really makes me disappointed, I think I did not know much about that place even after the whole leg, everywhere seems only chaos to me.
I am happy to see them visit Spain finally! I am very surprised that they never thought about exploring this country, and no leg has been done in Madrid yet! Also, Andalucia like Granada would be an interesting place to go.
Out of the un-visited countries, I think TAR could go to Nepal, Latvia, Bulgaria etc. which could be interesting and not dangerous to go