The Anta Grande do Zambujeiro, one of the largest megalithic monuments on the Iberian Peninsula, was discovered in 1964 by the archaeologist Henrique Leonor Pina. The grave goods discovered there are deposited in the Évora Museum together with a rich collection of prehistoric artefacts from other passage graves in the region (Anta dos Cabacinhitos, Anta da Loba and Anta da Mitra).
The monument was built between the beginning of the 4th and the middle of the 3rd millennia BC, between the Late Neolithic and the Chalcolithic periods, when the economy of the hunter-gatherers was undergoing changes with the flourishing of agriculture and animal husbandry as well as the perfecting of new technologies, with work in polished stone and with metal founding.
It is a large megalithic monument (a dolmen) comprising a funeral chamber made up of seven slabs of stone (props) and a passage about twelve metres long giving access to it. At the time of its discovery it formed an artificial mound surrounded by a structure of stones and earth more than 50 metres in diameter. On the surface, the only thing visible was the massive slab for covering the chamber (the capstone), which today lies broken nearby.