Kaliningrad oblast has belonged to Germany, Prussia, Livonia, or the Teutonic Knights from the High Middle Ages to 1945. And there's a bigger gap in Australia.
Kaliningrad oblast was a polish fief since the war 1454-1566 till 1657, with some special polish rights there until the partages.
It proves the need for a Tupi, Polynesian, and some African civ
Unlike the big blank spots in Africa, the central Europe is not just deserts and jungles. And unlike Tupi, Polynesia and the Congo, it contributed something to the mankind. Still, actually when I posted the bit about Poland, I thought about posting a comment about a possible Congo civ, which would be cool.