Many of the random 'stone circles' on the strat map that don't have a wonder associated with it, represent wonders that haven't made it into the game yet. There was a couple 'guy this building' threads a couple months back that had some pictures of the new wonders (like the one in Armenia).
Teleklos completely redid the wonders so that some could be torn down for appropriate amounts of money, and to fit more wonders in.
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