This is a photo of Jerusalem taken from the Mount of the Olives taken by an unknown photographer.
Site O is a group of people from around the world that share an interest in fortifications and artillery. Some are authors on the subject, some are connected with Universities and teach it and others are simply fascinated with it.
A Dictionary of Military Architecture
Bibliography of Military Architecture
Drawings of Aspects of Military Architecture
Jerusalem from the Mount of Olives
More Pictures of the Theodosian Land Walls
Siege Warfare, The Art of Offence and Defence