Barcelona is very fun. I went there on a 4 day pass when I was stationed in Germany.
Coolest city I've been to would probably have to Washington D.C., when I was in Ft. Bragg, North Carolina.
People just don't know how big of a party town DC is. All of the judicial buildings and monuments take up about 5% of DC. There is actually a high crime and drug rate there.
I partied my ass of with my Army friends there a lot.
Top three i think go too...,Heidleberg, Prague, Denver
You know, Pittsburgh could be a really great city if it weren't for all of the crooked politicians lol. Although, i guess that could be said for any city. Really though, Pittsburgh is quite beautiful and quaint. Having lived here most of my life now, i can say it's one of the most unlivable cities. That's a shame because it used to be rather nice.