@genmaicha cool historical buildings are nearly everywhere in europe, same goes for landscapes :P

a landscape classic in germany is the rhine valley, where you also can see some castles. iirc, there's a pretty nice train line going along that part of the rhine. you can get pretty decent food in this region of germany, it's a kind of mixture of traditional french (not the small birds, drowned in booze bullshit) and german cuisine.

i think the medium sized and small towns in germany (probably everywhere in europe) are often the better ones to visit, there is cool historic stuff there too and everything is cheaper and not as dirty as in the metropoles.