Derived from this thread: http://forums.civfanatics.com/showthread.php?t=465274 In my current game (v23, Eternity, Large) I'm in the Classical era sharing a big continent with a few other civs (there is also the "new world" I still haven't discovered because I didn't get to Astronomy yet). I have 2 sources of horse and a National Horse Trainer in my cities, for a total of 3 cities capable of producing horse-related units and buildings. I just finished researching the tech that unlocks Circus Maximus. I want to build it, and I see it requires Arenas and Hippodromes (5 total). Having only 3 cities capable of building hippodromes and little land left to hunt for horses (to create horse herds), I found out I won't be able to built this wonder. So I'm thinking, wouldn't it be better if Circus Maximus required only Arena and Hippodrome in the city that is going to build it instead of requiring 5 hippodromes in different cities? I feel it will usually be too hard to get the required number of cities capable of producing horse-related buildings. I have 18 cities, same as one AI, another one has 10 and the rest of them 5-6 cities. I think there are not enough horse resources in the map. There might be some in the new world, but to get there I need to research all the way to Astronomy, picking up the tech that would obsolete Circus Maximus on my way (I also think this is a wonder that gets obsolete too soon, it has a very limited usefulness time-window). What do you think?