Germany is famous for its roads without speed limits, called "autobahns". Perhaps in those years when German highways were glorified by tourists who visited there, in the rest of the world, including neighboring European countries, there were paths instead of roads.
Now in Italy, France, Austria, the Czech Republic and even Poland, highways are no worse and differ only in the presence of a speed limit.
In Germany, not all roads have unlimited speed limits, and every year there are fewer and fewer of them. Also, along these same unlimited routes there are frequent speed limits in places, for example, turns, of which there are sometimes a lot. If there is an accident or other force majeure due to the blocking of the road by police, firefighters, rescue services, tow trucks, a kilometer-long traffic jam can accumulate for many hours. On a pleasant note, it is worth noting that over 500 kilometers of travel there can only be one speed control radar, while in Russia there can often be several cameras per kilometer.
I haven't been to Berlin, Frankfurt or Dusseldorf, but I have visited rather boring Dresden and beautiful Hohenschwangau.
Bavarian castles are famous because of King Ludwig II. Due to his lack of interest in governing the country, economy and military affairs, and instead being attracted to the work of Richard Wagner, romanticism and the architecture of his castles, Ludwig II was called the “Fairytale King”. He did not create a family or an heir, and did not live up to the expectations of the highest nobility, but Neuschwanstein Castle is truly so luxurious that it is one of the most photographed places on the planet. When visiting Hohenschwangau, you can enjoy a pleasant walk through the high-altitude mountains, as well as row on a boat and watch the beautiful scenery from the water.
In terms of gastronomy, the Germans are so-so, but the tasteless food is compensated by good wine made from red grapes - Spatburgunder or white - Riesling. But there are also neighboring countries where you can have delicious food. And for the cultural program of Bavaria, due to the huge influx of tourists from all over the world, it is better to prepare in advance in terms of booking accommodation and purchasing tickets to castles.