Lanzhou is an industrial city of about three million people. It is located on the shores of the Yellow River and was a major stop on the Silk Road, where it was known as the Golden City. From the 5th to the 11th century the city was a major seat of Buddhist learning, and it acquired its present name during Qing Dynasty in 1656. Until 19th century, Lanzhou was the primary point in crossing the Yellow River. Lanzhou is one of the most polluted cities in China - there is a lot of industry here. And honestly, not that much to see.