Laser beams have revealed unknown structures, including the remains of a circus that hosted horse-drawn chariot races, that were once part of a sprawling Roman city hidden in what is now northern Spain.
Archaeologists announced their findings, which were part of a new pilot program, July 17, at a news conference. The researchers mapped the site of Iruña Veleia in what is now Álava, a province in the Basque Country, using lidar (light detection and ranging), in which laser pulses are beamed at the landscape from above and measured when they bounce back in order to image the terrain's surface, according to a translated statement from the Provincial Council of Álava.
