The Mayans were the second Mesoamerican civilization after the Olmecs. They occupied the territorry that is now Central America. At it's height, in 250- 900 A.D., there were over 40 cities with 5000-50000 people in each. As you can see it was vast civilization. They were very advanced in technology. They built huge stone step pyramids and dug canals. They made a calendar, a number system, and a writing system.