The main attraction in Mostar, where everyone takes photos. There are plenty of cafes and other shops around, the prices are inexpensive. Specially trained people jump into the water from the bridge from time to time, which is also an interesting sight!
The symbol of Bosnia, of course, is worth a visit, but I liked the old town much more, especially it's amazing how they can bind rivers into stone banks.
It's a cool little town. Two bridges. One is really small and looks like a big one. A very large bazaar of all kinds of souvenirs. Interesting architecture.