The final stop is Trier Cathedral or the Cathedral of Saint Peter in Palatinate,Germany. It's the oldest Cathedral in Germany. The foundation of this cathedral was built by Constantine around 326 AD in celebration of his anniversary of being a ruler.
The beautiful town of Trier in Germany (in the Ardennes and near the Luxembourg border) has a fantastic Roman past and a lot of the buildings remain. With an typical market square which is one of the best of the country, this town is worth the visit.