By Peter Alexander, NBC News Correspondent XIAN, China – We walked right into the Terracotta Army exhibit, standing side-by-side with 2,000-year-old relics. Imagine visiting the Constitution and being invited inside the glass. We filmed, uninterrupted, for three hours. For my on-camera element, what we call the "stand-up," I was given permission to walk among the warriors. The security guard begged, "Very be careful!" The tour was a once-in-a-lifetime experience. But, the road to get there was a study in Chinese bureaucracy. Here's how it happened: Dreamstime Thousands of terra-cotta warriors watch over Qin Shi Huang's mausoleum, in Xian, China. ...( read more ) ...