When you visit Yellowstone and all it's magical wonders, you are seeing the instrument of your doom.
A pyroclastic flow is referred to in Wikimedia as "a fast moving current of hot gas and volcanic matter". If you even see it you are probably done for. The hellish hot lava flow of fiery death can flow uphill and cross bodies of water. When it hits you, you become part of it's flow. You are part of the apocalypse machine. It's overdue to blow. It creates unpleasant worldwide chain reactions.
The chance of nuclear war is not a possibility, it is a certainty. Each year determines how likely it is to occur within that time frame. If you are like me, you live in the "nuclear sponge" which is the first kill zone. Missiles are placed heavily in Montana, Wyoming, etc. in hopes that our adversaries obliterate us before striking more populated areas. Even now, legislation is being passed to fortify the kill zones. None of this matters because in a nuclear war, strategies might buy a few minutes.
Either one of these events is quite likely within twenty years. We get front row seats. If you think about it, the end is well underway.
Have a fantastic day! Toby