4) Heidelberg

     With historic treasures like the medieval Old Bridge, the Heidelberg Castle, the Church of the Holy Spirit and the Knight St. George House, it is no wonder that Heidelberg is a popular tourist attraction. The city center’s main street, Haupstrasse, is packed with pubs, restaurants, museums, art galleries, shops and markets selling the likes of beer steins, cuckoo clocks and German sausages. Home to Germany’s oldest university, Heidelberg’s long academic history can be retraced along the Philosopher’s Walk, a scenic footpath often walked by many earlier philosophers and professors.