Cairo is the capital of Egypt and the largest city in the Arab world and Africa. Its metropolitan area is the 16th largest in the world. Located near the Nile Delta,it was founded in 969 AD. Nicknamed "the city of a thousand minarets" for its preponderance of Islamic architecture, Cairo has long been a centre of the region's political and cultural life. Cairo was founded by the Fatimid dynasty in the 10th century AD, but the land composing the present-day city was the site of national capitals whose remnants remain visible in parts of Old Cairo.