This tour opens closed doors for you, behind which a world of its own is hidden! You will enter vaults and corridors that are otherwise closed. Discover Kassel's lost old town and its hidden treasures during this tour. Accompany your guide on a walking tour through this district steeped in history. Let your guide show you hidden architectural details of bygone eras and tell you stories of kings, electors and prisoners. Highlights of the tour include the special opening of the Drusel Tower and a visit to the casemates.