Does it sometimes seem like every single inch of Earth has been discovered? Far from it. But scientists are working on it.

Learn more about the Mongolian Arc, a section of medieval wall that is changing how we understand the ancient populations of ...

In a new archeological dig, researchers have excavated parts of the Medieval Wall System (MWS), a network of walls and stretches that stretched for 4,000 kilometres (2,485 miles) across parts of ...