>> it's a closed basement surrounded by ground and concrete. Underground parking garages. The goal is to have lots of mass between you and the glowing stuff a

>> it's a closed basement surrounded by ground and concrete. Underground parking garages. The goal is to have lots of mass between you and the glowing stuff and a concrete monolith does that. All those 90-degree corners in the structure will then mitigate any blast damage without risk of being trapped behind any door. Just like an earthquake, you want to be far away from glass. A wet climate is also better as rain will wash the fallout out to sea. And not too cold. Fallout and snow is a bad combination. Just look at how dirty streets become when the snow melts. That's where the fallout will concentrate. So the best place to be on the day is probably a parking structure in a non-targeted city somewhere the pacific northwest.