The author took a train to Xi'an and visited several landmarks including a mosque, the Drum Tower from 1380 that was used to tell time, and a 14 km long city wall from the Ming Dynasty that they rode bikes on. They also saw terracotta warriors first discovered in 1974, aquariums, and on their last day visited an orphanage to give toys to babies. The food and history of Emperor Qin, who first united China, makes Xi'an an example of human ingenuity.