We have very poor understanding of Stonehenge, only build 5000 years ago. Throughout history many advanced civilisations have been wiped out for one reason or

We have very poor understanding of Stonehenge, only build 5000 years ago. Throughout history many advanced civilisations have been wiped out for one reason or the other, with only anedectotal stories left. It is not unlikely the context around nuclear waste storage on the surface is lost within generations.