​​​​​​​Every year, as Arbaeen approaches, lovers of Imam Hussein, from various countries, converge to his shrine in the Iraqi city of Karbala.

Muslims mark Arba'een, the 40th day that followed the anniversary of the martyrdom of Imam Hussein.

#Trending highlights the events surrounding the Great March of Arba’een and the various aspects of the event through the lens of social media.

Arba'een is a longstanding tradition in Islam, which marks the fortieth day after the martyrdom anniversary of Imam Hussein, the grandson of Prophet Mohammad. Now, Afghan migrants in Tehran have gathered to mark Arbaeen days ahead of the occasion.

Yemenis from all walks of life took to the streets of Sana'a to mark the tenth day of the lunar month of Muharram, the day in history that witnessed the martyrdom of the third Imam of Shia Muslims, Imam Hussein.

Faithfuls from across the Italian peninsula met at Rome's Imam Mahdi Islamic Center to honor the battle of Karbala and remember the sacrifices of Imam Hussein, the grandson of the Prophet of Islam. 

Leader of the Islamic Revolution Ayatollah Seyyed Ali Khamenei attended a mourning ceremony on the eve of Tasu’a, which is devoted to Abbas ibn Ali, Imam Hussein’s half-brother.