Working together as photographers since 1957 Bernd and Hilla Becher have become known for capturing endangered architecture quickly vanishing from the modern landscape By the end of the 1960s they were part of the conceptual art movement in view of their minimalist approach Bernd and Hilla Becher 4 Decades follows the couple through their retrospective exhibition at Berlins Hamburger Bahnhof Museum while they discuss their beginnings as documentarians of 19th century industrial architecture