Chichén Itzá is one of the world's most amazing wonders. Built in the sixth century, the ancient Mexican city speaks to the advanced math and science skills of the Maya. This elementary-level introduction, filled with vibrant photos and factual text, examines structures within the city and how they were constructed, from the observatory to the pyramid-shaped El Castillo. The city's significance in history and why it was built are also included. A Wonder Spotlight features the "shadow snakes" of Kukulcan's temple. Captions, on-page definitions, additional resources, and an index support young readers.