“No one disputes that the structure, called the Inca Uyo, is hundreds of years old. Everyone further agrees that the site, in the middle of a grassy enclosure where soccer matches and bullfights were once held, has been a moneymaker for this small town on the Andean high plains, near Lake Titicaca. But what seems all but certain is that the ruin, with 86 of the carved stones inside it, is not the ancient fertility temple that many here like to say it is.”