Cergorach
The Laughing One
But...Apparently you can, if your government is a council of archmages lead by a divination specialist. The Halruaan Elders saw the Spellplague in advance and planned for it by transporting their entire kingdom to another, safer plane of existence. That's Time-Lord-level awesomeness, which is why my pick is Halruaa.
At a great cost of Halruaan lives and loss of sanity among the realm's spellcasters, Halruaan mages used Lady Sheive's magic to use the energy of the blue fire to save most of their kingdom by shifting it into another world, Abeir.
And if you were by chance in the lands left behind... Oef!
I was thinking something similar as well, but that city hasn't had an update in the last three editions... It could be a hellscape for all we know...With that said, Huzuz, the "City of Delights", cosmopolitan capital city of Zakhara, seems like a pretty decent choice from a mixture of canon local stability and reluctance of any writers to touch it since the sub-line ended.
"All this has happened before, and it will all happen again"Elturel. Statistically, it's not likely to be dropped into the Hells or raided by mind flayers again anytime soon.