Ardebil, Ali Abad Cemetery
Four political prisoners executed in 1988 were buried in a mass grave in Ardebil. The families, who after lengthy inquiries learned what had happened, opened the grave and buried their loved ones in individual graves. The tombstones they put over the new graves were smashed by the authorities.
It is not clear if there are other mass graves in other parts of this cemetery or not.
To see the exact location of the mass grave, you need to zoom in.