In its first stories, the Justice League simply... existed. There was no long, drawn out story of Who It Was and How It Came To Be. Later, someone threw together a typically wacky tale of how the League was informed, involving the absurd Ersatzians, er, I mean Appellaxians and their attempt to take over Earth as a side-effect of their electoral process.
So, too, the JLA's HQ was introduced without ceremony or elaboration. They had a "secret sanctuary". It was deep within a hollowed out mountain.
Later on we learned that the Secret Sanctuary was, for no fathomable reason at all, in Rhode Island, by the ocean. Are there mountains sitting by the sea in Rhode Island? I don't think so. That's probably why the writers picked Rhode Island; chances are, most of their reader had never been there and hadn't the slightest idea what it was like.
The JLA holed up in the Secret Sanctuary for the entire Silver Age. Their tenure there--and indeed the Silver Age itself--came to an end when Snapper Carr betrayed the Justice League to the Joker, and the JLA modern to a very non-secret sanctuary "in geosynchronous orbit 22,300 miles above the earth" (as we were reminded in every story).
In later years, the Sanctuary would be used by Justice League successors, like the Detroit League, Young Justice and (briefly) the Justice Society. Those stays gave us several artistic interpretations of the Sanctuary, made possible by the fact that, as originally presented the Sanctuary was a tiny and unprepossessing place.
See those two empty chairs? Batman and Superman's.They seldom hung out with the JLA during the Silver Age.
Too busy walking their dogs in capes, I suppose.
That was it. An open-face garage for Diana's plane, a meeting table in a cramped lounge, and some funky stairs up to a library and communication center. That was it; the HQ for the world's most astonishing and powerful superteam was little more than a carriage house.
Even later, when it started to be implied that the Sanctuary might be larger, we had no idea what that meant. For the longest time, so much of whatever non-action scenes the plot required in JLA stories took place while they all sat around that damned table trying to figure out what the heck Snapper was saying, so there were few visual clues as to anything else in the Sanctuary.
Eventually, various inconsistent cutaway plans were drafted (see link above). But I only used what I saw in the stories themselves when I made...
The Secret Sanctuary Map!
I started with a few ideas. "The Conference Table" had to be in the middle of a big, cavernous space. Each of the original Leaguers should have their own quarters in the Sanctuary (even though they were never seen in the stories, it simply made sense as a practical matter), plus a guest room. There had to be a "library level". There had to be a waterway to Aquaman's room, and there had to be exits to the hangar and to the harbor.
I threw in some trophies as hindering terrain (since in JLA: Year One, the League was shown to keep trophies in their main hall rather than in a separate Trophy Room). I added a Teleportation Pad, since that figures so prominently in the Young Justice cartoon, and few suitable items of ostentation like the world rug and the "justice for all" inscription.
The map is fairly straightforward with the exception of Aquaman's uniquely amphibian living quarters, whose "dry room" has a hatch that leads to a pipeway that connects Arthur's bedroom directly with the underground stream that leads to the harbor.
If you print this map (PosterBrain will do a fine job for you; tell Poppy that Scipio sent you!), have fun by having each of the Leaguers start in their own bedroom and the attackers come in from the harbor and teleportation pad. Battle will probably take place in the main hall, with some maneuvering on the library level and the balcony of the quarters level. Let Aquaman take full advantage of the underground stream to sneak up behind his foes. If you field Batman make sure he hugs the walls where the trophies are, otherwise he'll be a sitting duck.
Some day I may try to compose a map that hews much more closely to the original, smaller design of the Secret Sanctuary, rather than being inspired by elements added later. But for now, enjoy this map and the individual touches that each hero brought to his or her living quarters.

