I was just over in Europe about 8 weeks ago, wife and I went over for a month. Visited Ireland, Germany and Italy. In Germany, you will LOVE the autobahn. I wish to God we had a road system like that over in the US but 98% of our drivers could never do it as they dont pay attention enough.
Far as places, the Nurbergring is a BLAST to visit! We took a tour ( they do have english tours so they say but when we went, it just meant they gave me a english handout and the tour guide spoke in German, my wife translated for me ) and got to go see all sorts of stuff on the track. Then even though I had never done anything like that before, I did two laps around the old circuit in my rental, Audi A4 and although I was by far the slowest, it was still a very fun experience. First lap was 14 mins 36 seconds and second lap was 14 mins 2 seconds. I highly recommend it
Paddock Entrance
http://i48.photobucket.com/albums/f216/sogwap55/Pic3.jpg
On top of the control tower
http://i48.photobucket.com/albums/f216/sogwap55/Pic1.jpg
Track security car "drools"
http://i48.photobucket.com/albums/f216/sogwap55/Pic2.jpg
The fairy castles were very cool too. We spent a day visiting them both. When you go, I highly recommend you spend the couple euro and take the bus up to it. You still will have to walk a bit but that 1.2 mile hike doesnt look far until you see how STEEP it is.
And make sure to go out on the rope walkway that gives a perfect view of the Nueschwistz castle ( sure I butchered the spelling )
http://i48.photobucket.com/albums/f216/sogwap55/Pic4.jpg
And other thing I recommend, if you can, just take a drive thru the Austrian Alps. We spent an afternoon just driving around in them, some of the most breathtaking scenery I've ever seen.
http://i48.photobucket.com/albums/f216/sogwap55/Pic5.jpg
Add me on facebook ( Brian Franchi ) if you want to see more pics, there is an asston loaded under different albums for each country we visited.