Of historical treasures in Damghan one must refer to the valuable Tappeh Hessar which was constructed before the birth of Christ. Professor Hertzfeld (1931-1933) and Dr. Schmidt (1933-1938) were the first archaeologists who explored the Tappeh.

Tappeh Hessar with several layers of civilizations is hiding a long history in its bosom. Part of the layers in the Tappeh belong to the Mades dynasty which shared its civilization with Mesopotamia. Another layer covers the Achamanid, Parthian and Seleucid periods. Tappeh Hessar achieved its peak of glory during the Seleucid and Parthian periods. During the reign of Tirdates 1 (Arcase II), Damghan was the capital of the Parthian Empire in Iran. With the discovery of relics from that period one comes across another layer which is ascribed to the Sassanians. Historical excavations has shown that the history of Damghan starts thousand years before the birth of Christ. For example Carbon 16 isotope inspections in Tappeh Hessar have revealed items belonging to 7,000 years ago. Recently expansion of Tehran-Mashhad railway into double lanes the body of a woman along with her fetus was discovered with over 7,000 years age.

Scientists have discovered metal in her teeth which leads us to believe that she was the goddess Tootam. Tootam worship was a religion which prevailed among the Iranians, Egyptians and Indians many thousand years ago.