Found mostly in Britain and France. Dolmens are megalithic tombs with a large flat stone laid on upright ones. Its word origin is mid 19th century. From French, or perhaps via Breton, from Cornish. Dolmen is a ‘hole of a stone’. Yet, this form of Neolithic Architecture is in modern Spain.
In the south, a long barrow form of dolmen, called a tumulus, and forms the Dolmen of Menga. It is 90 ft long, 20 ft wide and 11 ft high, and was built with thirty-two megaliths. The largest weighing about 180 tonnes. The chamber, probably served as a grave for ruling families. When it was opened in the 1800s, hundreds of skeletons were found inside. It is one of the largest known ancient megalithic structures in Europe. Dating from the 3750-3650 BCE Unesco has made it a world heritage site. It is near Antequera, Málaga, Spain. What a beautiful masterpiece.

Bibliography: Dólmenes de Antequera, nuevaacropolismalaga.org. June 2022

“Antequera Dolmen Sites”. Unesco.org. UNESCO. January 27, 2012. June 2022

Crucial new data on the origin of the Dolmens of Antequera, a World Heritage Site https://www.sciencedaily.com/releases/2018/06/180628120046.htm