Huge stone circles in the Middle East have been imaged from above, revealing details of structures that have stayed a mystery for decades... 

Archaeologists in Jordan have taken high-resolution aerial images of 11 ancient "Big Circles," all but one of which are around 400 meters (1,312 feet) in diameter.

Why they are so similar is unknown but the similarity seems “too close to be a coincidence". 

The Big Circles (as archaeologists call them) were built with low stone walls that are no more than a few feet high. The circles originally contained no openings, and people would have had to hop over the walls in order to get inside. Their purpose is unknown, and archaeologists are unsure when these structures were built. Analysis of the photographs, as well as artifacts found on the ground, suggest the circles date back at least 2,000 years, but they may be much older. 

The circles would not have been hard to build. They were constructed mainly with local rocks, and a dozen people working hard could potentially complete a Big Circle in a week. However, building the circles in a precise shape would have required some efforts.

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