the Old town hall is a beautiful pseudo moorish buildind built by the austro hungarian rulers in 1894. In 1945 was turned into the National Library. During the war in august 1992 it was intentionally targered with more than 50 shells and over 2 millions of books, periodicals and documents vanished in the flame.
A must for a couple of hours exploring or for us several visits. I guess some restoration has gone on recently, it's all very pretty and enjoyable, lovely part of town to spend time in.
Old town - is not as old as you can suppose, mostly built for the Olympic Games in 1984, but is a great place to walk, have a cake of buy some pseudo-turkish souvenirs.
From this part of the old town you can also have a look at the hills surrounding this city and neighborhood on those hills.