Most Ancient Mesoamerican civilizations built pyramid-shaped structures. Mesoamerican Pyramids served many functions from - from astronomical observatories to places of ritual worship and sacrifice, and perhaps something linked to extraterrestrials.
Non-ecological theories of Maya decline are divided into several subcategories, such as overpopulation, foreign invasion, peasant revolt, and the collapse of key trade routes. Ecological hypotheses include environmental disaster, epidemic disease, and climate change.
