Largest Pyramid by Volume

Buried beneath a hillside in Puebla state, the Great Pyramid of Cholula has an estimated volume exceeding 4.45 million cubic meters, roughly 1.8 times bulkier than Egypt's Great Pyramid of Giza even though it stands only about 25 meters tall. Built in layers by successive cultures starting around the 3rd century BCE, its base spans nearly 300 by 315 meters.