The oldest known metal tools date back about 50,000 years, and were made using iron from meteorites. Today, many of the world's most famous metal tools and hardware products are produced by the crafters of Yongkang, China.
With nearly 2 million relics, the Beijing Palace Museum is home to one of the biggest treasure troves of Chinese history and culture. It’s already the world's largest and best-preserved wooden palace, and it’s about to get even bigger.