Short answers, pulled from the story.
Hussaini Dalan was originally built during the later half of the 17th century during Mughal rule in Dhaka. In its present form, the imambara is attributed to Naib Nazim Nusrat Jung, who rebuilt it in 1823. The original construction date remains disputed.
According to a 19th-century account by Taylor, the building was constructed by a man named Mir Murad, who held the Darogahship of the Nawarrah Mehals and had charge of public buildings under Sultan Muhammad Azam. It was raised during the Subedari of Prince Shah Shuja, son of Mughal emperor Shah Jahan.
Hussaini Dalan serves as the main Hussainiya of Dhaka, functioning as the primary venue for majlis, or religious gatherings, during the month of Muharram. These gatherings commemorate the martyrdom of Hussain, the grandson of the Islamic prophet Muhammad, drawing both Shia and Sunni participants.
Hussaini Dalan incorporates both Mughal and British Colonial architectural traditions. The south verandah features four columns of Doric order, reflecting a western background, while an attached three-storeyed pavilion with arched windows and decorative kanjuras, or merlons, reflects Mughal characteristics.
On the night of the 23rd of October 2015, at around 2:00 am on October 24, a bomb was detonated in the Hussaini Dalan area during preparations for the Tazia procession before Ashura. One person was killed and over a hundred were injured. It was the first attack on a Tazia procession in Bangladesh.
The earthquake of 1897 damaged Hussaini Dalan. Nawab of Dhaka Sir Khwaja Ahsanuallah Bahadur subsequently rebuilt the present flat roof and added a verandah to the southern side of the building.