Thousands of huge ancient structures made of stone are clearly visible from the air. Their age is estimated to thousands of years and their purpose remains unknown. These puzzling wheel-shapes, and straight lines, stretch all the way from Syria to Saudi Arabia. Some call this area the Middle East's own version of the Nazca Lines.
It is only recently, with help of satellite images, that archaeologists have been able to explore this region in more detail. As a result, the resolution of available images is now generally high enough to conduct reliable, general archeological surveys.
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