The West Lake in Hangzhou is probably one of the most visited tourist spots in the whole of China. Apparently it's true beauty only appears when there's mist and fog around - having had a clear night when we were there, it seems fairly true. Without the mystical cover, it's a merely large, although very nice lake with a bright, and modern view.
(Oh, by the way: this entry was written by Peter Molnar, and originally posted on petermolnar dot net.)
