Yes my mistake. Should have read the article rather than just looking at the pretty pictures. :-)
Chichen Itza is large, but I don't think quite as massive as the Pyramid of the Sun. It might be higher though, I forget. Mexican archaeology is only an interest and not my area of expertise--which is in SW US puebloan groups.
It is, however, far steeper than either and the steps are more narrow than the average foot size, making the ascent and descent more dangerous.
My wife followed me to the top, but once there she panicked. Absolutely totally freaked out. I was finally able to coax her down on her butt, scooting one step at a time. I don't think me laughing the whole time was helpful at all.