China’s Xi’an is known around the globe for its terracotta sculptures. But that’s not the only story hidden beneath the city’s surface. Xi’an is set to become the world’s next leading smart city with underground infrastructure at the forefront of its innovation. In ancient China, the city was a beginning point of the Silk Road. Now, Xi’an is home to nearly 12 million people, and is a landmark spot on China’s new Belt and Road Initiative. Our Host James Chau explores the history of the city and i