It was protected by a ditch surmounted by a wall of mud brick and wood. All the houses were of mud brick. The walls, constructed out of mud brick, were decorated with fresco paintings. Moreover, the citadel walls were surmounted by structures of mud brick. In some countries there are entire cities made of mud brick houses. There are innumerable examples of mud brick or adobe building around the world. The walls on top, made out of mud brick, were an additional tall. In the center were excavated mud brick built houses. Amr had the original tents of Fustat replaced with mud brick and baked brick dwellings. The new facility is built of mud brick and hay. Timbuktu has many adobe and mud brick buildings but the most famous is the University. Heavy rain in the region has damaged the remains of the sun-dried mud brick constructions. Village homes are usually made of concrete blocks, mud brick, or wood and palm thatch. Mud brick was the basic material of the whole ensemble. These buildings were made of mud brick and built on top of one another.