I have had a frustrating time with these World Wonders. You spend all that time building them and then they don't even operate properly. here are some POSSIBLE bugs i have encountered in a couple play-throughs...maybe others can confirm these or list their own..
Angkor Wat
what it claims: Culture cost of acquiring new tiles reduced by 75% in every city
what it did: Only affects the city it is built in, not the whole empire.
Sistine Chapel
what it claims: An additional +33% Culture is produced in all Cities.
what it did: An additional +28.5% Culture is produced in all Cities
Great Wall -
what it claims: Enemy land units must spend 1 additional Movement Point when inside your territory.
what it did: Enemy land units must spend 1 additional Movement Point when inside your territory FOR THE REST OF YOUR EXISTENCE EVEN IF YOU LOSE CONTROL OF IT
Angkor Wat
what it claims: Culture cost of acquiring new tiles reduced by 75% in every city
what it did: Only affects the city it is built in, not the whole empire.
- apparently this is a "confirmed bug" already. pretty big disappointment when you build that and don't really notice much change.
Sistine Chapel
what it claims: An additional +33% Culture is produced in all Cities.
what it did: An additional +28.5% Culture is produced in all Cities
- I checked my culture from cities before I used a great engineer to immediately build it...it was 49 per turn. I had 0 culture coming in from city-states or anywhere other than cities. so 33% of this is 16.17. so i am expecting to have my new culture be 65. unfortunately it was 63, which is more like +28.5%. it's almost a negligible amount and easy to miss if you're not double checking the game's math, but I believe this is a bug. i distinctively checked where all my culture was coming from and how much i made before i used my precious great engineer on it. it's possible that my culture suddenly dipped for some reason, but i did not take on any new population as far as i can tell.
Great Wall -
what it claims: Enemy land units must spend 1 additional Movement Point when inside your territory.
what it did: Enemy land units must spend 1 additional Movement Point when inside your territory FOR THE REST OF YOUR EXISTENCE EVEN IF YOU LOSE CONTROL OF IT
- I captured a capital that had this Wonder already built. The next turn, the graphic of the Great Wall switched from spanning several of their cities to a couple of mine. ok cool, so now I have the Great Wall --not so fast. only through frustrating troop movement and loses did i realize that not only did I NOT have the Great Wall working for me, my opponent still had the effect working for him! I even annexed the city to see if I got the ability after 10 turns or something. NOPE. this has been the most frustrating World Wonder bug that I have encountered yet, because it actually affects my troop movement. so now i have to plod through his whole empire and let him dance around my troops for the next 400 years. great.