Iranian Revolution of 1978

Iranian Revolution of 1978–79, also called Islamic Revolution, popular uprising in Iran in 1978–79 that resulted in the overthrow of authoritarian regime and led to the establishment of an Islamic republic. People poured into the streets of Tehran and other cities, chanting anti-government slogans. Middle class Iranians, university students, and Islamist supporters of the Ayatollah Khomeini united to demand the overthrow of Shah Mohammad Reza Pahlavi. Between August and December 1978, strikes and demonstrations paralyzed the country. The Shah left Iran for exile on 16 January 1979, as the last Persian monarch, leaving his duties to a regency council. Ayatollah Khomeini was invited back to Iran by the government, and returned to Tehran to a greeting by several million Iranians. Iran voted by national referendum to become an Islamic Republic on 1 April 1979, and to approve a new theocratic-republican constitution whereby Khomeini became Supreme Leader of the country in December 1979. It was a relatively non-violent revolution, and it helped to redefine the meaning and practice of modern revolutions. From 1 to 11 February, is celebrated every year in Iran as the "Decade of Fajr. 11 February is "Islamic Revolution's Victory Day", a national holiday with state sponsored demonstrations in every city.
 If you are interested in the history of Iranian Revolution, Two Revolutions and a Coup Iran Tour, is a good choice for you to satisfy your curiosity. 

Iranian Revolution of 1978–79,Azadi Tower, Tehran