Tannenberg is the German name for the formerly East Prussian, now Polish, village of Stębark. It is still widely known by its German name due to two famous battles fought in its vicinity, in Battle of Tannenberg (1410) and 1914.
The city has been part of Poland since 1945.
External Links
The official website of the city of Olsztynek/Tannenberg: http://olsztynek.com.pl/