A state of the art survival shelter. Sorry but that's what I'd buy.
Same here. Of all the big ticket items I could think of this is the one which may actually be useful.
Besides that, I'd do the following:
1) Add a second story to my house
2) Bring my house completely carbon free and off-grid
3) Have full-time live-in help to take care of my mother
4) Give my brother, sister, and niece at least $1 million each, the idea being that they can quit their jobs and live life on their own terms
5) Invest the rest, hopefully grow it, and give to any charities I find worthy
I've always lived a fairly simple, spartan life. Having a lot of money isn't going to change that. I wouldn't even buy a car. Got by without one just fine all my life. I might buy a Tesla for my brother though. Basically to me money means security, not having to work a job you can't stand, and helping those less fortunate than you. It doesn't mean blowing it all on meaningless bling.