Schwerin Castle, in Mecklenburg-Vorpommern, Germany. Photo taken by Wikimedia Commons user Kolossos.

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Schweriner Schloss, or the Schwerin Castle, is located in the city of Schwerin, the capital of the Bundesland (name for German state) of Mecklenburg-Vorpommern, Germany. For many centuries it was the home of the dukes of Mecklenburg and later Mecklenburg-Schwerin. Since late 1990, it is again used as a place of government as the seat of the Landtag (state assembly) of the Bundesland of Mecklenburg-Vorpommern. There is said to live a small and friendly ghost in this castle named Petermännchen, who is thought to have keys to the entire castle and he roams around the corridors and tunnels unlocking doors.