Maybe this info is well known, but I didn't find it in CivOne code. But maybe I didn't look closely enough. So. When you capture a city, some buildings are gone. Of course, the palace always is deleted. But 3 other improvements are also always deleted: temple, courthouse and cathedral make sence - city now have new govt and probably new state religion too also all buildings with index more than Mfg. Plant are deleted (SDI, recycling center, power plant, hydro plant, nuclear plant, SS structure, SS component, SS module) And all even or all odd buildings are deleted too - which ones seems just random. That's all for military capture. But if you bribe a city with a diplomat - no buildings are deleted, except temple, courthouse and cathedral. It's not different if you incite revolt or subvert city. 'Admired cities' are similar to bribed cities: no buildings are deleted, except temple/courthouse/cathedral. (BTW, Temples and Cathedrals are totally useless if you don't know Ceremonial Burial/Mysticism or Religion tech. BUT it's impossible to have them in your cities because of these rules anyway. Interestingly, you will get 1 content citizen from Temple if you have Oracle wonder even if you don't know Burial nor Mysticism. But if you know only mysticism and no Burial - bonus from Oracle is still 4. But cathedrals without religion tech are useless even with Michelangelo.) EDIT: well, you can actually find about this Temples/Cathedrals behavior in darpanda's JCivED source code - in CityProcess.java. Line 1282 and so on.