Mosque of Ahmed Ibn Tulun
consisting of an open sahn with an ablution fountain in the center, surrounded by four riwaqs, the largest being the Qiblah riwaq. There are five naves on the Qiblah side (the side facing Mecca), and two on the remaining sides. The building style follows that of the Abbasid type, characterized by pilasters on which slightly pointed arches are applied, and which have a slight inward curve at the bottom.
Credit: khalid Albaih / Flickr