1. Heidelberg
The first one I describe to you is the Heidelberg castle. It is really big and has a secret stairway to walk up to it. Very few people know that way, most of the people go up by the "hill train". I mean, you can do that too, but imagine how incredible it is, when you walk up the more than 300 stairs (each stair has its number on it!) and see all the old houses around you, WOW!
Heidelberg itself has a strong history too and you see that on all the houses and the extremely expensive residential areas. Very famous people live in Heidelberg, such as Steffi Graf and famous Scientists. You should also walk through the, and now I'll give you a insider secret, "Philosophenweg" (Way of Philosophs). You may ask the people out there where exactly this way is, but however when you walk up that way, you have an really awesome, and I mean really awesome view to the Heidelberg castle and Heidelberg itself and its river (Neckar).
2. Schwetzingen
Not far away from Heidelberg (approx. 10km) is a small town called Schwetzingen (yes, I live in this town and I love it!). The special thing here is, that this town has just 22,500 residents, but also a huge castle! When you visit German castles you will realize, that some of them not so big, but beautiful too. The castle of Schwetzingen is not just beautiful, it's awesome and huge! The city itself spends all of the entrance fees (only 2,50 EUR per day) into this incredible castle, and you see that at each corner stone, plant and bloom.
The Schwetzingen castle is almost as big as the city itself! :-)
Its history goes back to Baroque, Rococo and Classicism. It's still apparent today that the irregular complex of the Schwetzingen castle in essence dates back to a medieval castle altered in the Renaissance period.
3. Stuttgart
Stuttgart area has, believe it or not, seven (yes 7!) castles and palaces. I only explain one of them, the new castle, because it is soooo huge, awesome and one of the most beautiful German castles.
The New Stuttgart castle was built in 1746 as a representative baroque residential palace for "Duke Carl Eugen von Wuerttemberg" (long silly name, isn't it). After over sixty years of construction with repeated interruptions, the interior and exterior were completed in 1807. So much to the history.
When you are finished with the visit of this castle, downtown is not far away and you can explore this too. You will find many interesting restaurants, pubs and cafés.
4. Rastatt
This town is located close to the city Karlsruhe, 70km in the south of Heidelberg (I mention Heidelberg, because it's one of the most known German city).
The Rastatt castle is huge too and you have lots of things to explore there. It is the oldest baroque residence on the Upper Rhine River and has been completely preserved since being built from 1700 to 1707 (yeah, in the year 2000 it had its 300th Anniversary!).
The area is very beautiful and the town spends lots of money in this incredible castle. After your walk through this residence you have a really short way to downtown and to its nice pubs and restaurants.