'Everything' is pretty close. I've talked to a few pre-war ghouls to get a comparison but I can't wrap my head around it. Hell, I can barely wrap my head around the Wastes some days. I've scavenged the ruins though.
So many places just frozen in time from when the bombs dropped. Empty cups on tables in front of computers full of emails still opened. Most of D.C. is in ruins and the only away around the bulk of the rubble is through the Metro. Which is full of rabid ghouls, mole rats, and other things that want you dead. Pretty much outside of 'civilization' everything wants you dead and sometimes that's the better option.
But humanity still struggles on. Still tries to make it better. We have fresh water in the Capital now for the first time. We make do.