Hundreds of tourists throng the canals of Xochimilco every weekend for a flamboyant display of sombreros, food, music and art. Yet, as they cruise alongside the chinampas, or "floating gardens", most remain oblivious to the fact that they are looking at an ancient engineering wonder. These man-made island-farms are the last vestiges of a massive 14th-Century land reclamation project of the Aztec Empire that continues to feed the people of Mexico City even today.

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