Amazing! Check out the future of plan of Shanghai Metro:
Download the full size (3040×2548) map. 3.75M
There are so many metro lines under the city. There are some huge transition stations with as many as 4 metro lines. This will be a huge change to the city.
Metro is the nature part of my life already. Xiao Li described the close feeling with the Metro in this entry: the Metro (Chinese site) Good article!