Try Middle Europe. Take a train from Prague to Vienna to Zurich and on to Paris .. or Berlin, Copenhagen, Amsterdam, I mean if you plan things properly, its a very, very comfortable way to ride around see Europe properly: slow enough to grok the landscape.
I've done Krakow to Prague and Prague to Zurich and both of those were fantastic experiences. I've also done Verona to Paris which I would rate less highly - the Thello is significantly more expensive for a less comfortable train, additionally we were stopped and all passengers checked on the French border, which hadn't happened entering either the Czech Republic or Switzerland.
Try Middle Europe. Take a train from Prague to Vienna to Zurich and on to Paris .. or Berlin, Copenhagen, Amsterdam, I mean if you plan things properly, its a very, very comfortable way to ride around see Europe properly: slow enough to grok the landscape.