Of course, being holed up in a giant concrete rectangle shares a glaring commonality with all of the other options we've presented so far: it's brain-meltingly lonely. If eking out a living amongst a limited group of survivors doesn't sound like your idea of a scorched-earth paradise, then you might instead consider ...
The Entirety Of Switzerland
Switzerland, as we've pointed out before, is sort of insane. Not only is every adult male issued an assault rifle by the government (and trained how to use it), but the entire country is rigged to explode -- you know, should the need arise. Good thing the entire country is also effectively one giant bomb shelter.
Time Out Switzerland
And some can bomb back.
In case of nuclear death raining down to melt men like so much scrumptious chocolate, every single citizen of Switzerland is promised protection in a bunker -- because having ready access to a bunker is the law. There are around 300,000 of them in private dwellings, presumably each featuring a shelf on which to prominently display their government-issued rifle. When building a home, families must either factor in the cost of a bunker or pay into a community one, and in the case of renters, landlords are required to provide bunkers capable of housing all their tenants. To cover any stragglers, there are over 5,000 government shelters open to the public.