The paper examines BBC television programmes that feature museum spaces of science and technology, contextualizing the development of this programme type in the 1950s and 1960s with science (and history-of-science) broadcasting. In 1971, the BBC televised a ten-part series devoted to UK science and technology museums. Within These Four Walls, the central case study, featured episodes filmed at the Natural History Museum, the National Maritime Museum, the Royal Institution and the Science Museum, among others; its televisual tour guides included prominent science broadcasters – Patrick Moore, George Porter and Eric Laithwaite – as well as curators and scholars of the history of science, such as Joseph Needham. The paper explores, using intermediality as an analytical category, how the museological conventions of curated gallery displays and tours have been adapted and transposed to television. In doing so, it reflects on the historiographies that emerge from this intermedial product (a series of televised museum tours), arguing that they should be interpreted in the cultural context of the early 1970s. It concludes that the presentation of historical authenticity through intermedial constructions of place, objects and performances conferred what Thomas Gieryn has dubbed ‘truth spots’ on history-of-science narratives for audiences.