We did about 3 weeks in Europe driving between countries: Germany (which was West Germany in 1989 when we were there); Luxemborg; Belgium; and the Netherlands.
We found out on that trip that we don't do car trips well, particularly when travelling on the autobahn at a blinding rate of speed, with me attempting to navigate using a map in German. I still tell everyone that if it had been easier to get home, I would have left his *** on the honeymoon. As it is, we are still together.