Berlin’s Neue Nationalgalerie is an epoch-defining structure by the architect Mies van der Rohe. It was opened in 1968, shortly after his death. Nearly 50 years later, the director Ina Weisse sets out to examine the period during which this unique edifice was constructed. She’s the daughter of architect Rolf Weisse, who used to work in the offices of Mies van der Rohe in Chicago. In addition to the unpublished film material shot by him, the film contains interviews with her father Rolf Weisse, Mies van der Rohe's grandson Dirk Lohan, architect David Chipperfield – who is commissioned with renovating the building – and others.