This gorgeous city was heavily bombed during the Croatian War of Independence from 1991 to 1995. Fortunately much of damage has been fixed, but if you look closely you can see evidence in some of the ancient stone houses.
It takes about an hour and a half to complete the tour here--make sure to bring a sweater as temps really drop when you reach the bottom. This, too is a UNESCO World Heritage site.
Not really the best place to eat or drink, but September might be one of the few times of the year that it's actually nice outside and worth checking out the swan boats.
On one of my first trips to Boston, I was given the "Make Way for Duckings" book and taken to the Public Gardens. The bronze duck statues in homage to the book are very cool. Also, the Swan Boats have some real classic charm.
Crazy architecture and some really cool exhibits if you're into music and sci-fi. Nirvana, Avatar, Scary movies, and an instruments playing lab were the highlights while we were there.
War Horse or Wicked would be my preference, but if nobody is interested in either of those, I could be talked into being dragged along to one of the others.