Originally Posted by: Dreadnought 
A very broad question, and as Mr. Marklin says much discussed in many threads here.
Hamburg is the home to Modelworld, often billed as the largest model train layout in the world. I believe Berlin also has a large layout. The Porsche "Traumwerk" layout is in Germany, though I believe Salzburg Austria is the closest city. Fribourg in Switzerland has the "Kaiserberg" layout which is very good.
For train spotting the Gothard pass at Wassen has been a popular and beautiful trainspotter location. One of my favourites is the Brenner pass between Austria and Italy. The locomotives are switched from Austrian to Italian. There are some fascinating switching operations.
A lovely train trip is the Arlberg run from Innsbruck to Zurich.
D
Indeed, many threads and discussions here. And I am completely surprised which distances some people wants to travel within only a couple of days. Probably I would think about it in a similar way and actually I did it already too. But ….
Of course you may go to Hamburg MiWuLa (= MiniaturWunderLand),
http://www.miniatur-wunderland.com/http://www.hamburg-touri...Dj5JmF4tQCFWko0wodiXULSwbut Hamburg is about 700 km away from Goeppingen. OK, by plane 1 hr 20 min flight, by car 7,5 hrs and even by train 6,5 hrs travel time (the train is so fast because it uses longer distances of Germany's high speed train system). Yes I have been at MiWuLa and it is worthwhile to go there, no doubt about it. They also offer special tourist packages on their homepage, but ...
But almost no interesting sightseeing points were mentioned nearby (300 km circuit) to Goeppingen, ok perhaps the Wies'n (= Oktoberfest -
http://www.oktoberfest2017.de/) in Munich (
http://www.muenchen.de/int/en.html)Here only some thoughts and hints for a visit of a railway enthusiast closer to Goeppingen.
I gathered a few links and list them here, but please help yourself.
Bavarian railroad museum Noerdlingen
http://www.bayerisches-eisenbahnmuseum.de/Bahnpark Augsburg
http://www.bahnpark-augsburg.de/Steam Dinner in Augsburg on Youtube
or Blue Star Train
http://www.blue-star-train.de/tee-ausstellung.htmlDeutsches Museum München – Modelleisenbahn
http://www.deutsches-mus...ilitaet-technik/#c115884Model railroads
http://www.miniland.de/of course Hans-Peter Porsche TraumWerk
http://www.hanspeterporsche.com/and here a list from Wikipedia about all public model railroad layouts in Germany and Bavaria. Please do not switch to the English language, because it is not a translation, it is a different site.
https://de.wikipedia.org...r_Modelleisenbahnanlagenand a Youtube video about their model railway
shops for model railroader in Munich (no recommendation and not complet, just infos where you may buy your Oktoberfest Maerklin wagon)
http://www.modellbahncentrum.de/http://gleis-11.de/https://www.maerklin-store-muenchen.com/shop/If you visit Hans-Peter Porsches Dream work than you should consider to make a tour to the close city Berchtesgaden and the lake Königssee and the Kehlsteinhaus (Eagles Nest)
http://www.kehlsteinhaus.de/en/index.phphttps://www.berchtesgadener-land.com/en/homehttp://www.muenchen.de/i...ons/lake-koenigssee.htmland then of course Salzburg, the home of Wolfgang Amadeus Mozart, only 20 (yes twenty not two hundred) kilometres away from HP Dream Work.
https://www.salzburg.info/enOk – one recommendation I will do. Switzerland for a railroad enthusiast, you need 2 weeks minimum and every day is worthwhile of this visit, no doubt about it. But for those who only have one day to visit a railroad in the mountains, I recommend a trip from Munich by the train on top to the highest mountain of Germany, the Zugspitze, 2962 meters high.
It is possible doing it as a one day round trip from Munich to top of Germany and back. You take a train in Munich, switch in Garmisch-Partenkirchen to another train, which leads you up directly to the Zugspitzplatt, 2588 m high. There you switch to a cable car which brings you on top of the mountain and the restaurant there or to the tunnel which you can pass with a short walk to Austria
https://www.zugspitze.at/en/and back, because there is the border to Austria too.
Please read here by yourself:
http://www.muenchen.de/i...tractions/zugspitze.htmlhttp://zugspitze.de/en/summerhttps://en.wikipedia.org...varian_Zugspitze_RailwayI have done this trip by myself twice and it is not a cheap trip but a gorgeous one. An easy, relaxing trip by train in one day from Munich on top of an almost 3000 meters high mountain and back. A must for every railway fan, I think. Garmisch-Partenkirchen is about 90 km away from Munich.
Finally and just for info and special interests and it has nothing to do with a railroad.
In Munich is the worldwide headquater of BMW located with its own BMW world.
http://www.bmw-welt.com/en/Right beside the area where the Olympic Games took place in 1974. So you also may visit the Olympic tower, the Olympic Tent, and Olympia Park there.
http://www.olympiapark.de/en/olympiapark-munich/Happy reading
TEEWolf