Compared to the other two sites, Chichen Itza is by far the most impressive one, hence why it is one of the 7 Wonders of the World. On the downside though, it is obviously also the most crowded and touristy one.
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Teotihuacán is even older than Chichén Itzá, with its famous Pyramid of the Sun believed to have been constructed around 200 AD – 300 years before Chichén Itzá.
Teotihuacan appears to contain features of various cultures, including the Maya, Mixtec and Zapotec. Whatever the case, Teotihuacan was founded as early as 400 B.C., though the largest structures of the city weren't completed until about 300 A.D.
As one of the largest and best-preserved archaeological sites in the world, Chichen Itza is home to a myriad of ancient Mayan marvels and rich cultural histories cherished by travelers across the globe.
One of the most interesting recent discoveries about Chichen is related to an essential aspect of Mayan life: water! In Chichen Itza, the cenotes are the only source of fresh water. These underground rivers are pure crystal water, a product of filtration through the limestone subsoil.