So, first and foremost, you must visit Xi'an, it is the center of culture and heritage in China. The first and oldest of the four great capitals.
The actual tomb of the emperor Qin shi huang is still yet to be excavated and likely, never will be. Another tomb still left un excavated is that of Empress Wu Zetian. These are just two big examples, and there are others.
Yeah agreed, I have only been to Shanghai and Beijing basically because I was there for business. However Xi'an would be a fund place to visit for fun. Thanks for the nice post, and good luck with your blog.