This synthesis proposes to analyze an original wood construction dated to the end of the Iron Age discovered in the heart of the oppidum of Bibracte (Saône-et-Loire, France). Archeological excavations in the area of platforms PC14 and PC15 offer evidence of a new earth and timber architectural complex. It covered an area of 1,900 square meters and was used for half a century, between La Tène D2 and the end of the Augustan period (70/60 B.C.E. – 15 B.C.E./5 C.E.). Four successive revisions can be described accurately : the first three phases were made of wood and earth and the last one was a composite architecture of stone and wood. The characteristics of this monumental construction indicate that it was certainly a public building with original architectural features and techniques. Yet, although this monumental building is very well documented archaeologically, its exact function remains enigmatic. While evidence is lacking for us to draw finite conlusions in that regard, this article proposes to investigate its probable function(s). This is accomplished by comparing the PC15 complex to similar structures found at other archeological sites in France, such as one from Tregueux, the public place of Thésy-Glimont, and the sanctuary of Corent.