Researchers Discover Vast Underground Cities in Cambodia

Using cutting-edge laser scanning, archaeologists in Cambodia have just discovered massive underground cities near Angkor Wat. The massive subterranean cities, presumed to be roughly 900 to 1,400 years old, stretch across a staggering 734 square miles—about the size of Cambodia’s capital Phnom Penh. Experts believe that the new discovery will dramatically change the longstanding theories on how the Khmer Empire was developed. Head to The Guardian to learn more.