London's Tate Modern is the world's most popular museum of modern and contemporary art, with 5m visitors a year. Only 20 years ago it was the shell of a defunct power station on the banks of the Thames. Now it is expanding with a £260m extension that opens next month. Edwin Heathcote, the FT's architecture critic, previews the new building with one of the architects, Jacques Herzog, and Tate director Nicholas Serota.
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