This is a list of lost inventions:
Greek fire
Damascus steel
Construction technique involved at Saksaywaman where blocks were put into place by carving them precisely. The method used to match precisely the shape of a stone with the adjacent stones is unknown
Iron pillar of Delhi, notable for the rust-resistant composition of the metals used in its construction.
The high-precision small holes in the blocks of stones at Pumapunku
Artificial petrifaction of human cadavers invented by Girolamo Segato
Roman concrete
