The special buildings currently available on the right hand side are the tower, merchant shop, oracle and divine statue. I am quite stuck on which to build on a couple of my cities, as they are in an area where I am not particularly fearing attack and the rest seem useless. The oracle is soon to be replaced by war council, but I don't know when but this would be a nice implementation. The merchant shop seems fairly useless but it and the Tower can be useful for WW cities. The oracle will only prepare you for attack, but not defend you, so what is the best option for a city that is secure?