Firstly, this expansion includes two new wonders - Clock and Rome - to give players more options for what to build.
Secondly, there are new science tokens that can be mixed with the original tokens, allowing you to, for example, keep military cards that you would normally discard, or always have the cat ability available.
Finally, this expansion includes a new game element: medals. At the beginning of the game, a random medal is drawn and placed face up between each pair of players. (Each pair already has a card stand between them, so now two items will be present.) When one of these players meets the conditions shown on a medal, they claim the medal and flip it over, earning 4vp for this medal at the end of the game.
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