The Amazon jungle wasn’t supposed to have been the site of something this big. The mound, known locally as Montegrande, spans more than two acres at its base and stands as tall as a five-story ...

Analysis of hair from 22 mummies found in southern Peru has revealed the earliest known use of San Pedro cactus, a source of mescaline, and the psychoactive plants that make up the drug ayahuasca. The ...