Algeria
Islam is the predominant religion in Algeria, with its adherents, mostly Sunnis, accounting for 99% of the population according to a 2012 CIA World Factbook estimate, and 97.9% according to Pew Research in 2010. There are about 150,000 Ibadis in the M'zab Valley in the region of Ghardaia.
Architecture of Algeria
Islam reached Algeria in the 7th century via the Arab conquest of Northern Africa. Islamic conquest brought many of the hallmark features of Muslim cities to Algeria, including the souq as a commercial center, hammam as a social center, and the mosque and accompanying madrasah as a religious center. The casbah, or fortified citadel, was also introduced to Algeria during this era.