The most interessting parts of the world are all done already.
Perhaps some areas in Asia, Bangladesh for instance or Indonesia, the Kuril islands, could be find some interessts, depends from scenario.
To come in the fictive world, a what if scenario: Prussia
What would have been if in 1990 Gorbatchev would have had pulled out all soviet troops and people from Kaliningradski rayon and the "old communist" guard which were wipped out from the GDR (east germany) had taken over this area. Prussia would have been reborn, Kaliningrad would have been Königsberg again. A military dictatorship with the clear aim to regain all territories which had belonged to East and West Prussia. Of course Poland would not very happy to see such a new and aggressive german state at their northern border and .....