For me, the highlight of Brad Meltzer's JLA has been his introduction of the Hall of Justice, located in Washington DC (something I've been a very strong advocate of).
But as someone who lives in DC, I'm a little frustrated by the vague tree-shrouded background; where in DC is the Hall of Justice? I mean, we know where the JSA HQ is; it's not just "somewhere in Manhattan".
So where is the Hall of Justice? Couple things we can deduce about its location...
It is not on the Mall.
No, no, non-DC residents; I believe a man can fly, but I will never believe that big-ass building was secretly erected on the National Mall. That would take an act of Congress and, even more daunting, approval by the Pennsylvania Avenue Development Corporation.
It's on private property outside the original city (that's everything south of Florida Avenue).
I mean, they build the thing in the six months they were sitting around that table, without anybody else knowing about it. To me that means a Big Honking Fence on a set-back property; it sure as heck ain't in downtown or Midcity.
If it were, everyone would know, because the Intowner would have had weekly updates on the zoning meetings and ANC debates about it ("Ward 3 Neighborhood Forum Heres Residents's Objections to Constrution of Hedquarters of National Organization; DC Historical Preservation Society Weights in On Possible Obskuring of Lampost Lanmark"), and the City Paper would have a cover story with an in-depth human interest angle on every single local businesses even slightly disrupted or inconvenienced ("Justice Beleaguered: The JLA protects you from destruction; unless you're their neighbor.").
That's just the kind of people the Leaguers are. No point in making a public headquarters that the public can't get to. I mean, it's not like it's the National Arboretum or the Jefferson Memorial!
Personally, I'm picturing it on the site of National Cathedral (because no one knows what the point of that is in our universe, let alone the DCU). Big area, lots of room for trees and a reflecting pool, but still located directly at an extremely public location (the intersection of two great thoroughfares, Massachusetts and Wisconsin Avenues).