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The first wonder is the Great Wall. It prevents barbarians from entering your cultural borders on the continent it was built on. It also doubles the number of Great Generals that emerge from combat within your cultural borders and requires Masonry to build.
The second wonder is the Temple of Artemis, presumably meant to be the one at Ephesus but since it's Civilization it's just as much at home in Addis Ababa. The temple will double income from trade routes in the city it's built in and generates a free priest specialist in that city. It requires Polytheism to build and the development of Chemistry obsoletes it.