2/3. Two European giants of modern architecture - Le Corbusier and Mies van der Rohe - helped the skyscraper reach a new high point in its evolution as their work changed skylines across countless cities. In the early 1900s the tower was a symbol of the future, but what factors led to the dream being seen as fatally flawed, and housing projects demolished on both sides of the Atlantic? Alan Yentob investigates.
(Stalin's Skyscraper is at 9pm on Friday on BBC4)

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