My favorite shot of El Castillo, the Pyramid of Kukulcan, at Chichen Itza
We visited Chichen Itza on a lovely day in March 2009. We got there before the tourist buses rolled in and had most of the site to ourselves for a few hours. This is my 3rd or 4th trip here and I still enjoy it even though you can't walk on any of the monuments any more. I'm still amazed by quality of the work, most of it done about 1,000 years ago. I'm amazed by all the astronomical precision of the buildings - I find it hard to believe that the builders of Chichen Itza didn't have outside (ET?) help, but that is just my humble opinion. If you have a chance to visit this great site - go!