Looking back through history taking a city with walls WAS a mammoth task up until the invention of the cannon. In CIV terms though that is quite a wait before any large scale conquering can really be done, although in the past I noticed the AI didn't us walls a lot anyway.
I think there should be a terrain improvement for "Walls" that complements fortifications. The building of the Great Wall surrounds the cultural border that encompasses your capital...
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