Quote Originally Posted by salsabike View Post
I think if you're a European Union citizen, they probably don't stamp passports from one EU county to another--but I don't know this for sure.
Nope, they don't. Border crossings within the EU are like crossing the state line in the US. Driving from Stuttgart, Germany to Strasbourg, France last year we were not asked for any ID.

Even before the EU, you just needed to show valid, current ID at the border crossing (as my cousin did driving from Germany to Austria and back). As the American, I had to whip out the passport, but even then it wasn't stamped.