Where to get into fallout series?

[veti]

What's your favourite vault?

Not as a place to live. Obviously, even the best of them would suck. But the one that sticks in your mind as having a cool story, artfully revealed during exploration?

I'm thinking like Vault 11, whose inhabitants were told to offer a human sacrifice every year. Just got done exploring that one for only about the second time ever. It's a gentle yet horrible mix of tragic and hilarious.