A team of anthropologists from the University of Wyoming, the University of California, Santa Barbara and the University of New Hampshire has discovered a 4,750-year-old megalithic circular plaza measuring 18 m (60 feet) in diameter at Callacpuma in the Cajamarca basin of Peru. This is one of the earliest known monumental and megalithic structures in the northern Peruvian Andes and one of the earliest examples in the western hemisphere. The 4,750-year-old...
