The impressive ruins, which have been named a UNESCO world heritage site, are located in the very south of the state. It is one of the largest cities of the classic era of Mesoamerica. The size and architecture is very unique and different from other ruins in Mexico which makes it one of the most important sites in the country. Only about 50% of the buildings have been excavated and from them the most spectacular is the pyramid of the Niches. #ruins #history #architecture #culture #pyramid