Combine the international city of Frankfurt with the scenic beauty of the Black Forest with this itinerary! Frankfurt, officially Frankfurt am Main, is a metropolis and the largest city of the German federal state of Hesse. It is the fifth-largest city of Germany after Berlin, Hamburg, Munich, and Cologne. Welcome to the most international city in Germany, the largest financial center on the continent, the historical city of coronations, the city of Goethe and the Frankfurt School. On the River Main (a tributary of the Rhine), it forms a continuous municipality with the neighboring city of Offenbach am Main. The Black Forest is a mountainous region in southwest Germany, bordering France. Known for its dense, evergreen forests and picturesque villages, it is often associated with the Brothers Grimm fairy tales. It's renowned for its spas and the cuckoo clocks produced in the region since the 1700s. The region’s largest town, Freiburg, is filled with Gothic buildings and surrounded by vineyards. Few holiday regions are as diverse as the Black Forest. Its 11,400 square kilometers in the south-west of Germany are home to a rapidly changing landscape, with forests in the north, the less dense central Black Forest, and the mountainous south that leads down to the Rhine.