The Great Wall of China is one of the wonders of the world. It is one of the few man-made objects that can be seen from space. Some parts of the Great Wall date back to when the first emperor of the Qin dynasty wanted to protect the northern states, following the unification of China in 221BC. The Great Wall is now a popular attraction, and, as the saying goes, "He who does not reach the Great Wall is not a true man". A trip to the Great Wall will be made as part of the 2017 program.