It may be one of the Middle East's most mysterious structures, but it's easy to miss from the roadside.
The prehistoric stone monument of Rujm el-Hiri, or Gilgal Refaim, went unnoticed for centuries in a bare expanse of field in the disputed region of the Golan Heights.
Now archaeologists have dated it to 5,000 years old – making it roughly the same age as Stonehenge in Wiltshire – but they still don't know who built it, or why.
Theories include an ancient calendar, or a 'sky burial' site in which dead bodies were placed on top of stone mounds to be picked apart by vultures.
Archaeologists first spotted the monument, composed of five stone concentric circles, by studying an aerial survey.
The images were released after Israel captured the territory from Syria during the 'six day war' of 1967, 53 years ago, what now is a part of Israel.
Since this discovery, a number of excavations have revealed it's one of the oldest and largest structures in the region.
And now shards of pottery and flint tools have been used to date the site.
Scholars generally agree construction started as early as 3,500 BC but other parts may have been added to the structure during the following two thousand years.
By comparison, Stonehenge is believed to date back around 4,614 years.
Known as Rujm el-Hiri in Arabic, meaning the 'stone heap of the wild cat', the complex has a 15-foot-high (4.5 metres) burial chamber at the centre of five circles, the largest of which measures more than 500ft (152 metres) wide.
Its Hebrew name of Gilgal Refaim means 'wheel of giants' and refers to an ancient race of giants mentioned in the Bible.
Unlike the famous English monument built using around 100 huge stones topped by lintels, the Golan structure is made of piles of thousands of smaller basalt rocks that together weigh over 40,000 tons.
'It's an enigmatic site,' said Uri Berger, an expert on megalithic tombs with the Israel Antiquities Authority.
'We have bits of information, but not the whole picture.
'Scientists come and are amazed by the site and think up their own theories.'
Standing on the ground inside the complex, it looks like a labyrinth of crumbling stone walls overgrown with weeds.
But from the top of the 16-foot-high (5 metres) burial mound, it is possible to make out a circular pattern.
Only from the air does the impressive shape of a massive bull's-eye clearly emerge.
Dr Berger said no-one knows who built it – another parallel to Stonehenge, the purpose of which has remained a mystery for millennia.
Some think Rujm el-Hiri may have been constructed by a nomadic civilisation that settled in the area, but it would have required a tremendous support network that travellers might not have had.
Whatever the case, it is thought the monument could have astronomical significance and may have been used as an observatory.
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