I found this by accident on google earth. It's pretty interesting and weird. I guess that people's best speculation is that it is a remnant from nuclear testing

I found this by accident on google earth. It's pretty interesting and weird. I guess that people's best speculation is that it is a remnant from nuclear testing around the 60s. Google earth URL https://earth.google.com/web/@40.01244676,-119.000836,1390.18813777a,1040.89059732d,35y,263.87826055h,0t,0r https://earth.google.com/web/@40.01244676,-119.000836,1390.1... This seems to be some other discussion about it: https://aair.smugmug.com/Aviation-Archaeology-1/Giant-concentric-circles/i-B6RhZHQ https://aair.smugmug.com/Aviation-Archaeology-1/Giant-concen...