The world's biggest block of flats for 30,000 residents - complete with its own shopping mall, cinema and ski slope - is being built in Egypt with the help of property tycoon Mohamed Hadid at a cost of £420million.

The gigantic Skyline building is set to be built on the outskirts of the capital Cairo and will ease overcrowding in the city which has a population close to 21 million people and is expanding by 500,000 a year.

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