Missile Silos??
It reminds me of a few years ago, overflying China from S Korea to Europe, during the winter when the wasteland below was covered in a white blanket of snow and ice. We were well north and no towns, roads or other signs of life had not been seen for some considerable time. Suddenly, three clearly visible circles appeared through the snow, almost like something out of a 007 movie ??? a missile silo for example!!
I have ever since wondered what was really there and wished that I had taken a photo or two. I have taken the same flight a number of times since, but have never seen the site again. Have I not looked at the right time? Was the aircraft slightly off course? Did I imagine it? What I saw did not look anything like the photos shown with the article.