For all the history enthusiasts and people that just try to find the best way to explore the city this is probably the best way to do it. During both of my tours i encountered a very interesting and passionate tour guide named Zeljko that actually knows how to communicate any ideas about the city. Even though the tour lasted 2.5 hours, in the end i wasn't tired because i have learned much more than i've ever expected from a free tour. Furthermore, you'll learn some secrets and some nice details about the city that you're not going to listen to them in any other place. I'm planning to visit again the city and the first thing i'm going to do is have another tour with these guys. Thank you guys for everything!