Author 'Nicoledesplat' (Id 100350 ) : In Malansac ride (Brittany) I came face to face with this magnificent dolmen corridor under cairn. The dolmen is a megalithic monument. It is the oldest preserved architecture of the Western world. The dolmen is a collective burial (tribe or village). Some dolmens have been used repeatedly throughout the Neolithic period (6,000 to 2,000 years with J. C). Here is represented a "dolmen corridor comprising: a corridor and a room sépulcrate or funeral. The side walls and ceiling are formed by large slabs. This frame is covered by a cairn (mound stepped). The architecture of dolmens has evolved during the Neolithic period between 4,500 and 2,000 years BC The dolmen corridor to the oldest found in Britain date from 4670 BC I was told to Kercado in Carnac. I will go soon to his discovery. A note here is the natural state "slate".