I read this book, "Chichen Itza: The History and Mystery of the Maya's Most Famous City," by Charles River Editors, on an airplane on my way to Merida and a visit to the city, one of the New 7 Wonders of the World. Although I had done quite a bit of reading about the site, it was a while ago and I wanted a refresher before seeing it.
The book does a good job of describing the basic elements of the blend of Mayan and Toltec elements that infuse much of the site. There are good photographs and fairly accurate descriptions of the major structures such as El Castillo (the large pyramid), the Skull Platform, Temple of Jaguars, Temple of Warriors, and the Caracol. The latter building is the astronomical observatory and, according to our guide, is where the Mayan calendar was developed.
It is astonishing that these people, without a telescope or computer, could accurately track Venus, Mars, the Sun, and Eclipses. And they could engineer structures to utilize the position of the sun on certain days of the year. This was probably happening, according to the book, between the 5th and 9th centuries. These highly sophisticated astronomers, architects, and engineers also worshipped gods like the feathered serpent, Kulkulkan, and the rain god, Chaac. They sacrificed humans.
Actually, so little is known, largely because the Spanish Bishop de Landa destroyed all of the Mayan texts. Everything about the origins of Chichen Itza, life there, and the decline of the city is the product of archeological excavation, resulting in inference and considerable speculation.
It is puzzling, then, when the editors chose to contradict their title and say there is no mystery here. There is, they say, "complexity and obscurity" and caution the reader not to confuse that with mystery. Their point, oddly, is to say they don't know anything for sure, but they do know one thing - extraterrestrials were not involved! Interesting they would even bring that up. So what if that is one theory and has been the subject of documentaries, as they point out? They do not explain why one theory is more plausible than another.
The book ends with the account of the site's rediscovery in the 19th century, it's addition to the list of World Heritage sites, and the elevation to one of the New 7 Wonders in 2007. Footnotes and an excellent bibliography are included.