As the title states I'm seeking recommendations for must see places on or near my route which will run from Koblenz to Vienna. So that is more or less a straight line via Frankfurt, Nuremburg and Regenburg. My plan is the be leaving Koblenz no later than third week in May and be in Vienna by the end of May. So might be willing to spend a little time at must see places. We are in a Motorhome so prefer to use camp sites on outer ring of large towns/City's then use local transport to get in. Thanks in advance.