Chinese archaeologists have found a group of huge rings at the site of the 1,300-year-old tomb of Wu Zetian, China's only empress, but they 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 were 30 to 40 meters in diameter and were in a zone 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 the diameter of 110 meters sited in fields, he said.
Crop circles!!!!!