Watch The Path of Enigma (2017) : Full Movie Online Free The lack of material evidence left behind by Expo 67 is staggering. So remarkable, in fact, that we felt impelled to explore the site of the world’s fair in detail, searching for clues that throw light on its past – a kind of material archaeology à la Walter Benjamin, who sought in materiality the remnants and rejects, the traces of an ancient history that might reverberate down to the present.