Watchtower

the headquarters of the Justice League of America. The Watchtower was constructed of promethium and used highly advanced Martian, Thanagarian, Kryptonian, and Earth technology. The arrival of Orion and Big Barda added the technology of New Genesis and Apokolips to the systems within.

Areas of the Watchtower were shown when super-villain Prometheus made his debut and downloaded the Watchtower blueprints. Among them: Getting to the Watchtower and around the various areas is facilitated by teleportation tubes placed for easy access in the event of an emergency.
 * "The Hall of Justice" - housed atop the Watchtowers' peak is the conference hall where the League meets and plots strategy, assigns duties and engages in open discussion. At its center is a round table, a nod to Camelot's Knights of the Round Table. There are 12 seats, 7 or 8 of which are reserved for the core members with their respective insignia. The JLA symbol itself is prominently placed in the center of the table.
 * Promenade - a large area devoted for ceremonies (as seen when Aztek was inaugurated as a member) as well as a place to assemble a large contingent of superheroes in cases of extreme necessity.
 * Monitor Womb - the heart of the Watchtower, stretching the entire center of the complex. It houses the Leagues' vast computer/communications/sensor network. All crisis points are detected through this circular chamber with multiple holographic displays. Although monitor duty is assigned in a revolving system, Martian Manhunter often volunteers for this as his great telepathic powers are uniquely attuned to the Martian technology. Batman has also been seen using this room to plan and strategize in private on several occasions
 * Trophy room - various memorabilia from the League's past cases as well as sculptures/tributes to fallen heroes. Some notable memorabilia include Green Arrow's trick arrows, Booster Gold's armor, Kanjar Ro's Gamma Gong, various alien weapons/gadgets, a container of Kirby Dots (a humorous reference to Jack Kirby), and galleries of past League rosters.
 * Armory/Hangar - adjacent to one another, this area houses a variety of specialized equipment the League or its allies may need depending on the mission as well as space-worthy ships capable of intergalactic travel.
 * Hydroponics - this area houses a variety of alien flora which has greatly efficient photosynthesis compared to terran plants, serving as the Watchtower's source of oxygen.
 * Aquarium - serves as Aquaman's private quarters as well as housing marine life from other worlds.
 * Private quarters - each core member has a specific private quarters for extended stays. Individual quarters are personalized for the members' tastes and lifestyle (such as Wonder Woman's Greek-themed quarters or Martian Manhunter's meditation chamber). Additional guest quarters are available as well.
 * Other areas: Power Core, Recreation area, Holographic training room, Laboratories, Med-lab, Technology/Engineering Workshops, Containment Cells.