Susa is known as one of the oldest cities on the planet with continuous inhabitancy and its history goes back to the Elamite, Parsian and Parthian empires. Susa has one of the most fertile earth in the region because of the rivers of Karkheh and Dez. The remaining of the ancient Susa still exists in the modern Iranian town of Shush. The tomb of Daniel which is the traditional burial place of the biblical prophet is located in Susa and is a respected attraction among Iranian Muslims and Jewish.
Tchogha Zanbil is one of the few existent ziggurats, dating back to the Elamites era. It is composed of ruined palaces and temples. This ziggurat is the largest of its kind in Iran and It was inscribed on the list of World Heritage Sites of Iran by UNESCO in 1979. Tchogha Zanbil is 130 km away from the city of Ahvaz, in Khuzestan province of Iran.
Around one hour and half away from the city of Ahwaz, there is a complex irrigation system with water mills, dams, tunnels, and canals. It is inscribed on the list of World Heritage Sites of Iran by UNESCO. The history of Shushtar Hydraulic System dates back to the time of the Achaemenian king, Darius the Great. The function of this system was to supply water for local people both in peace and war time.