The "Pyramid of the Moon" at Teotihuacán, the site of an ancient city near modern-day Mexico City, is aligned with the sun on the summer and winter solstices, a research team in Mexico says. However, not all experts agree with the assessment.
Teotihuacán flourished between roughly 100 B.C. to A.D. 800 and had a population of around 100,000 people. The "Pyramid of the Moon" was built in stages between roughly A.D. 1 and 350 and is located at the end of the "Causeway of the Dead," a long street that runs through the center of the city.
