walls into a compound with courtyards and private spaces. Multiple entrances and exits allow access to accessory facilities such as kitchens. Igbo architecture uses similar construction techniques and materials as Yoruba architecture, but varies significantly in spatial arrangement. No unified compound walls exist in these constructions. Instead, individual units are related to a central leader's hut, with significance attached to relative position and size. These elements are believed to affect present-day residential house design, especially when designating spaces as public, semi-public, semi-private, or private. Benin The rise of kingdoms in the West African coastal region produced architecture which drew on indigenous traditions, utilizing wood. Benin City, destroyed during the Benin Expedition of 1897, was a large complex of homes in coursed mud, with hipped roofs of shingles or palm leaves. The palace contained a sequence of ceremonial rooms and was decorated with brass plaques. The Walls of Benin City were the world's largest man-made structure. Fred Pearce wrote in New Scientist: In 1691, the Portuguese Lourenco Pinto observed: “Great Benin, where the king resides, is larger than Lisbon; all the streets run straight and as far as the eye can see. The houses are large, especially that of the king, which is richly decorated and has fine columns. The city is wealthy and industrious. It is so well governed that theft is unknown and the people live in such security that they have no doors to their houses.” Benin City’s planning and design was done according to careful rules of symmetry, proportionality and repetition now known as fractal design. The main streets had underground drainage made of a sunken impluvium with an outlet to carry away storm water. Many narrower side and intersecting streets extended off them. Hausa Kingdoms The important Hausa Kingdoms city state of Kano was surrounded by a wall of reinforced ramparts of stone and bricks. Kano contained a citadel near which the royal court resided. Individual residences were separated by earthen walls. The higher the status of the resident the more elaborate the wall. The entrance-way was maze-like to keep women secluded. Inside, near the entrance, were the abodes of unmarried women. Further on were slave quarters. Gobarau Mosque Gobarau Mosque is believed to have been completed during the reign of Muhammadu Korau (1398–1408), the first Muslim king of Katsina. Originally built as the central mosque of Katsina town, it was later also used as a