I have a hard time with the term, "castles of eternity." While they had walled cities, the Egyptians didn't devlelop castles until the Europeans brought them in, sometime in the Crusades.

Now, I realize I'm nitpicking because castle is technically a very different thing from a walled fortress (a "fort" in the old Western movies isn't a castle). And I'd be interested to look at how the phrase is being used to see if it might be translated more accurately by putting in other terms or words.