The Justice League Watchtower was the headquarters of the Justice League of America. The Watchtower was constructed of promethium and used highly advanced Martian, Thanagarian, Kryptonian and Terran technology. The arrival of Orion and Big Barda added the technology of New Genesis and Apokolips to the systems within.
History
The Watchtower was destroyed by Superboy-Prime[1] and superseded by the The Hall, based on Earth, and Satellite Watchtower in space.[2]