“Teotihuacán was one of the first urban centers in central Mexico and is now one of the most important archeology sites in Mexico. It was constructed between the 1st and 7th centuries CE, but we know very little about the people who built it and lived here. They built the first complex cities in the region and then mysteriously disappeared. The Pyramid of the Sun is the largest building in Teotihuacan and one of the oldest pyramids in central Mexico. It is also one of the largest, and as you can see from this reconstruction, it was a spectacular mountain of a structure.”