Chinese archaeologists have found a group of vast rings at the site of the 1,300-year-old tomb of Wu Zetian, China's only empress, but are unable to explain their existence.
At least 10 rings appeared on aerial photographs taken by experts from the Xi'an Preservation and Restoration Center of Cultural Relics and Qianling Museum in a survey of Qianling.
Most of the rings are between 30 to 40 meters in diameter and are situated in an area four kilometers long from east to west and two kilometers from south to north, said Qin Jianming, a researcher with the center.
The most eye-catching was the largest ring, with a diameter of 110 meters, he said.
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