One of Mexico's many UNESCO World Heritage Sites, what is this "wonder of the modern world"?

Answer Chichen Itza

Of Mexico's 34 UNESCO World Heritage Sites, Chichen Itza takes the cake. The Mayan ruins in the Yucatan peninsula have been called one of the "Seven Wonders of the Modern World". One of the things that make Chichen Itza so special is its central pyramid, El Castillo, which sees a snake shadow appear to slither up the steps during winter solstice.

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