The Ducal Castle in Szczecin (PL: Zamek Książąt Pomorskich w Szczecinie) was the seat of the dukes of Pomerania-Stettin of the House of Pomerania (Griffins), who ruled the Duchy of Pomerania from 1121 to 1637. The Griffins' standard can be seen all over the castle grounds, including around the impressive mechanical clock on the tower. The castle was also the childhood home of Sophia Augusta, who became Tsarina Catherine the Great of Russia. On the lower levels, you can also see an open-glass display on the floor level of the 8th-century fortifications that once stood in this castle's place, as well as a 'Witches’ Cell' that actually only ever held one so-called 'witch': Sidonia von Borcke, a Pomeranian noblewoman blamed for the premature death of Griffin Duke Philip II. In February 2021, archaeologists discovered a Nazi-era tunnel network below the castle, however its purpose is yet to be confirmed.