This summer, high temperatures and a drought created conditions that led to the collapse.Heavy rain caused a part of a pyramid built more than 1,000 years ago to collapse in late July, according to Mexico's National Institute of Anthropology and History.Located in the state of Michoacan in southern Mexico, the pyramid was part of a seat of power in a site known as Ihuatzio, the institute said.This summer, high temperatures and a drought created conditions that led to the collapse, as they caused cracks to form in the pyramid. When the rain fell, water flowed into the cracks and compromised...