The Watchtower has been shown as being on the moon (in the orbit of Earth on the Justice League Unlimited cartoon), the base is supplied with the most highly advanced technology of many planets including, Earth, Thanagar, Mars, Krypton, New Genesis and Apokolips as members hail from these various planets. It is made of promethium, a nigh-indestructible metal in the DC Universe. Since it is not on Earth it can be reached through the use of its teleportation tubes.

Rooms in it included, The Hall of Justice, Promenade, Monitor Womb, Trophy Room, Armory/Hangar, Hydroponics, Aquarium, Power Core, Recreation Area, Holographic Training Room, Laboratories, Med-Lab, Technology/Engineering Workshops, Containment Cells and each members individual private quarters.

But the Watchtower was destroyed by Superboy-Prime and as such has been replaced by the Satellite Watchtower (in space) and The Hall (on Earth).