In ancient time a fire had been continuously flaming inside Sarmasjed Temple of Masjed-Soleyman. That is why it became possible to find oil and gas in the Middle East by an Englishman, William Knox D'Arcy, a hundred year ago and paved the road towards today's conflictions in the region.
French archaeology expedition under the supervision of Professor Roman Ghirshman made some important discoveries in Masjed-Soleyman. Ghirshman believes the present site of Masjed Soleyman (Parsomash) was the oldest capital of the Achaemenian Kingdom.
Masjed Soleyman's importance today is in oil exploration. William Knox D'Arcy, by contract with King Mozaffaroddin Shah Qajar, obtained permission to explore for oil for the first time in the Middle East, near this city. This event changed the history of Iran and the Middle East forever.