Find out why Chichen Itza is considered one of the New Seven Wonders of the World. The ancient city has been traditionally divided into two distinct parts and periods, even if there is some overlap both in time and design, and together they cover some 16 square kilometres. The earliest, in the south, is native Maya dating to the Epiclassic period (c. 800-1000 CE) with buildings displaying the distinct 'Puuc' architectural style and Maya hieroglyphs. The plan is more spread out than other parts of the city and, constructed on a roughly north-south axis, may reflect the course of the Xtoloc Cenote water source. The second part of the city has been traditionally dated to 1000-1200 CE and is more mysterious, creating one of the most contentious debates in Mesoamerican archaeology. Built in the Florescent style and along a more ordered plan, it displays many hallmarks of the Toltec civilization, leading scholars to believe that they either conquered Chichen Itza as they expanded their empire from their capital Tula over 1,000 km away, or there was some sort of cultural and trade sharing between the two centres.