What is so special about Chichen Itza? Where do I start.... As one of the Seven New Wonders of the World, Chichen Itza was built by the Mayan people in the 5th century AD. It blew my mind to see the massive architecture and design of the ruins in person. The Mayas were extraordinarily knowledgeable about astronomy and math -- which you can see showcased in the insanely well-constructed structures.