The anniversary of the Islamic Revolution is observed in Iran every February 11, marking the end of the Iranian Revolution that led to the downfall of the Pahlavi dynasty and the establishment of the Islamic Republic of Iran. The revolution began with demonstrations against Shah Mohammad Reza Pahlavi in 1977, escalating into a campaign of civil resistance that culminated in the Shah's departure on January 16, 1979. On February 11, revolutionaries took control of key government buildings and media outlets, effectively ending over 2500 years of Persian monarchy. This public holiday is widely celebrated across Iran with military parades, firework displays, and various festive events sponsored by the government, reflecting the significance of the revolution in the country's history.