Chichen Itza is a well-known Archaeological Site. It was a large pre-Columbian city built by the Maya people of the Terminal Classic period. Today the site is located on the Yucatan peninsula in Mexico.
(Included in the 7 wonders on 7th July, 2007)

Structure:
It is divided into Old Chichen(6 Mayan ruins) and New Chichen (20 Mayan ruins). The main ruin is Chichen Itza Pyramid or El Castillo. This is 79 feet about the Main Plaza. This tells us about the astronomical abilities of Mayan- the structure has a total of 365 steps I.e. the number of the days in the solar year.
What do you think, did they know this or is it a coincidence?