Just outside Mexico City stand ancient pyramids that are as intriguing to people today as they were to the Aztecs who discovered them centuries ago. Part of the Mesoamerican city of Teotihuacán, they were built by an unknown ancient civilization. Travel back in time with this fascinating book to explore the pyramids of Teotihuacán, some of the world's most mysterious pyramids. Also includes a page for caregivers and teachers that suggests guiding questions to help aid in reading comprehension.