Must see places while going through Germany (middle section)

What you call the "middle section" is still quite vast. Here is a proposal.

From Belgium, you can transit via Luxembourg and then head to Trier, Germany's oldest city. It has among the finest Roman relics north of the Alps, such as e.g, an amphitheater and public bathes.

Continue southwards to Völklingen. There you can visit the famous and impressive Völklinger Hütte (Ironworks), an important piece of industrial heritage.

Then you will cross the Pfalz (Palatinate). On your way you can visit the Trifels Castle. The Palatinate is home to some of Germany's finest red and white wines. Don't forget to try the Saumagen, a local specialty. The Speyer cathedral is worth a visit too.

Next head to Nürnberg. If you are interested, you can can pay a visit to the technical museum in Sinsheim. The famous Hockenheim Ring is on your way too. Depending on the agenda and your interests it might be worth a stop.

Nürnberg has a nice old town dominated by the imperial castle. For me, the most impressive sight is the Nazi Party Rally Ground (Reichsparteitagsgelände). Definitely worth a stop and even a detour.

Some 60 kilometers north of Nürnberg, stop in Bamberg. This city has quite a big and well-preserved historical center. Very picturesque.

My next stop would be Dresden, with its world famous historical monuments (Frauenkirche, Zwinger, ...).

After Dresden, and beofre going to Poalnd, go to the Spreewald. This is a very special place. After the driving so much you will be able to breathe some fresh air. In Summer you can have a boat tour on the numerous waterways. In Winter, ice-skates are indicated rather than punts.

Since Bayreuth lies almost directly in your path of travel, you would almost certainly want to take in the Margravial Opera House, which is one of the most dazzling examples of high baroque architecture in central Europe. The inside of the threatre is breath-takingly opulent. Bayreuth also has a few other 'surprises', not to mention Bavarian cuisine. Avoid Bayreuth in August.

The Landschaftspark in Duisburg is an outstanding place on the industrial route. It's an old, closed steel mill with surrounding buildings. It's free and open round-the-clock, which makes it a thrilling experience as you walk up one of the towers in the middle of the night and completely on your own. It's nicely lit, but you'd better take a torch.

Driving along the Rhine river (between Mainz and Koblenz), there are a lot of "must-see-places" especially Rüdesheim and Loreley. I have been there more than 20 times, and I am still loving it