Weimar is situated not only in the heart of Germany, but also in the heart of Thuringia. It is also surrounded by a number of other interesting cities. You can reach the state capital of Erfurt and the university city of Jena with a short train ride -- and the ride is free with your summer school ID.
The Wartburg in Eisenach, the Bauhaus in Dessau or the classic cities of Dresden and Leipzig are only 1-2 hours, Berlin 2,5 hours away from Weimar by train.
Learn more about the state of Thuringia!