In Cairo is the history and detail of our past. In the old city are the houses with keys in the door left behind, here are the libraries with no custodians to guide, here are the limps unlit and prayer rugs covered in dust, all waiting for its children to return and ask the same questions as those before us, the Fatimid, Ayyubid, Mamluk and Ottoman have done their duty – out of an immaterial love they created the city that became the mother of the Muslims.