Ten human skeletons, arranged lying on their sides in a circle with their arms intertwined, have been unearthed in an ancient burial pit to the south of Mexico City. The roughly 2,400-year-old bones represent the first time anything like this has been discovered, according to a statement from the National Institute of Anthropology and History, or INAH. Most of them belonged to adolescents, but the researchers have also identified one skeleton as that of an adult, another of a child between three and five years old and another of a baby about one month old, according to the INAH statement. Archaeologists made the discovery on the lands of the Pontifical University of Mexico, or UPM. The "spiral of human bones" was the most unusual finding that any INAH archaeologist has made since beginning field work in the area more than a decade ago, according to the institute's statement. read more Disclaimer: Chances are that this post was requested by an advertiser.