This article presents a comparative analysis of archaeological sites in northwest Iberia focusing on Neolithic spatial concepts and their materialization in different architectures from this period. The recently excavated site of Montenegro in Galicia is analysed to determine how the construction of circular enclosures reproduces the organizational model of space identified in monumental architectures elsewhere. The origin of these constructions, their functionality and their relation with other archaeological phenomena are explored to show how they are all different versions of the same concept. Finally the authors discuss what they consider their key point that the prevalence of circular design may be recognized behind the diverse materialities as an essential instrument of Neolithic societies which began to tame the world.