Milan is mainly a modern city, surrounded by industrial suburbs. It has many tall apartment and 
 office buildings in the business district and extensive residential and industrial sections. 
 A subway system was opened in 1964. The principal square is the Piazza del Duomo, at one end of 
 which stands the Duomo, or cathedral, a huge Gothic structure of white marble, begun in 1386 and 
 completed in 1965.

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