Kush Khana in Fatehpur Sikri comprises an octagonal chamber roofed internally with ribbed dome, encased within a colonnaded veranda. The structure stands in the middle of a spacious octagonal court, surrounded by additional colonnades, now much overgrown. An excavation at this site has revealed five cultural periods which has pushed the antiquity of the place by at least four thousand years before present. The locality was occupied by communities who habited in the Ganga-Yamuna doab during the second millennium B.C. and belongs to Ochre Coloured Ware Culture of copper age.