Our journey begins in the picturesque city of Detmold. The 53-meter-high Hermann monument lies just southwest of the city. The Externsteine, a rock formation not far from the monument, is also a popular tourist destination. So is the town of Bad Iburg in the Teutoburg Forest. Bad Iburg is known as a spa town, but it also features a stunning castle complex and former monastery. After that, we move on to the city of Osnabrück. It's a university town with a historic city hall that was the site of the Peace of Westphalia - the peace treaties that brought the Thirty Years' War to an end.