The Ancient Pyramid Builder crossword solutions are the Maya and AZTEC civilizations. The Maya were a Mesoamerican civilization that flourished in southern Mexico, Guatemala, Belize, and El Salvador from around 2000 BC to the 16th century AD. The Aztecs were a Mesoamerican civilization that flourished in central Mexico in the 14th to 16th centuries AD. Both civilizations were renowned for their impressive architectural achievements, including the construction of ancient pyramids.