Lasers reveal 15th-century fortified Zapotec city in Mexico
They found that "it covered 360 hectares [890 acres], with over 1,100 buildings, four kilometres [2.5 miles] of walls, a network of internal roads and a clearly organized urban layout with temples and communal spaces such as ballcourts, and the elites and commoners lived in separate neighbourhoods," according to astatement describing the research.