Monte d'Accoddi

40.7880°N, 8.4427°E.

Monte d'Accoddi in northern Sardinia, Italy — a stepped platform pyramid built in two principal phases between approximately 4000 BCE (Phase 1, an earthen circular platform) and 3650 BCE (Phase 2, the dressed-stone stepped trapezoid that survives today). Original base 36 by 29 metres; original height 10 metres on a stepped trapezoidal platform with a long ramp on the south side leading to the summit altar. The structure is the only dressed-stone monumental pyramid known from Neolithic western Europe — its closest architectural parallels are the contemporary Mesopotamian platform temples 4,000 kilometres east, with no documented diffusion route between the two traditions. Excavated by Ercole Contu for the Italian Soprintendenza Archeologica della Sardegna between 1952 and 1958 and re-examined by subsequent Italian missions through the late twentieth century. The summit preserved a sandstone offering altar and a flat dressing surface for ritual use.

The only Neolithic stone pyramid in western Europe, built three thousand years before the Etruscans, in a structural template independently invented in the western Mediterranean and Mesopotamia at approximately the same century.