People are everywhere in Shanghai. It is basically impossible to get anywhere with out people running into you. Literally they will run into you if you don't move, it is that highly populated. All I can really say about Shanghai is that it is a massive city that contains 20 millions people. The city is huge and really the only place to go it up. So there are immense skyscrapers all across the skyline. The architecture is insanely beautiful and just adds to the uniqueness of the city. Also, Shanghai is one of the most westernized cities so far in my visit to China it, is also very clean compared to all the other cities we visited as well.