The Great wall of china always looks out of place when looking at the city from ariel veiw, perhaps in Civ 4 the great wall should be visible on the map. possibly spannig the border between you and the most warlike civ on your borders.

Furthermore the great wall of china didn't automaticly put walls in every city when it was built in real life, so why does it in the game??

1) They already stated wonders/improvements would appear on the map when built in cIV.
2)Does the Sistine Chapel really act as a hospital in real life? Or do the great pyramids put a granery in every city in really life? They got to give you some reason to build them.