“…Even it if is different, the main question is whether this feeling of authenticity is satisfying to the visitors. On this topic, the research conducted on the visitors to the Chauvet 2-Ardèche Cave (Duval et al 2019b), enriched by observations made in the Vézère Valley and the Cantabria/Basque Country region (Stummer 2019), demonstrate that the qualification of an authentic experience depends largely on the care taken to create a simulacrum of the underground environment (sensation of going underground, dim lighting, humidity, odour, underground landscape), in other words, the role of materiality in the construction of a credible work (Foster and Curtis 2016;Holtorf 2013;Jones and Yarrow 2013). The differences between Lascaux 2 and Lascaux 4 (Figures 3a, 2b, 2c and 2d) are partly because Lascaux 2 has remained open to the public (even if it was the necessity to close it that justified the construction of Lascaux 4), with sold-out visits in the high tourist season, praised by the visitors and tourism actors in the region: Seriously, if you must choose between the two, go to Lascaux 2, this visit is much more intimate, it feels like we're in the real cave, with the smell and humidity.…”