Archaeologists in China have discovered a 2,800-year-old fortified wall that predates the country's first emperor.
The wall, which runs through a narrow mountain pass in the eastern province of Shandong, was first constructed in around 800 B.C. At that time, it was about 33 feet (10 meters) wide. But it was expanded during the Warring States period (circa 475 to 221 B.C.) to be about 100 feet (30 m) wide, the Chinese news outlet Global Times reported.
