Xiguan is indeed a unforgettable place, where ancient arcade buildings and modern architectures are integrated as a whole, without any sense of disharmony but with more beauty resulted from cultural collision. If a metaphor is really needed, Xiguan is like Cancer to me. Its charm comes from the bone, containing thousands of years of tradition, and also containing an openness that you can not understand, just like Cancer, when you think you know it completely, in fact, you may not understand it at all.