The existence of an internal timberwork architecture in Iberian Iron Age ramparts has been widely discussed. During the last decades, new data is changing our understanding about this building design in the Iberian Peninsula. In addition to some singular sites, such as Chao de Samartín, there is a small number of vitrified walls in Spain and Portugal. Thanks to geo-chemistry analyses and micro-photography, we have been able to identify timbers and nails impressions in the masonry. Furthermore, developed 3D virtual restitutions of buildings with evidence of the use of timber, such as the so-called ‘Cuerpo de Guardia’ of the oppidum of La Mesa de Miranda (Ávila, Spain). Excluding the Late Bronze Age Chao Samartín’s timber wall, all other cases are dated between the Late Iron Age and the earliest presence of the Roman army in Western Iberia and therefore we propose that these ramparts could have been built following a murus celticus design.