Again, I have 13 days (11 days in Europe 2 spent traveling) as I mentioned in an earlier post.
What about a sidetrip to Eastern Europe. Forgive me if I am a bit culturally ignorant but does Eastern Europe compare to Western Europe? I heard there are more young people activities.
Keep in mind, what sights/ things to do would you recommend for a 20-something.
My brother Tejas posted about Prague above.