Just thirty years ago, Shenzhen was a basically a fishing town near Hong Kong. Then it was designated a special economic zone by the Chinese government. Factory complexes and office buildings sprouted like weeds and now they have 10 million people. But since it's a recently planned city, it feels different from any Chinese city I've every visited - streets are wide and seem less chaotic because there are virtually no bicycles and hardly any scooters (I've mostly been driven on just a few main streets).
So it's all new, and while it's mostly typical looking office, factory, and apartment buildings, they do have some pretty amazing architecture here and there. The Shenzhen City Hall shown here is especially striking. The nearby library and concert hall are also quite beautiful.