The Castle is the main command center of the UN's Checkmate.
History of location has not yet been written.
- Appearances of Checkmate Headquarters
- Location Gallery: Checkmate Headquarters
- Catalogued images related to Checkmate Headquarters
History Section Needed!
The history section for this article is either absent or contains very little information. You can improve this article by adding as much relevant historical information as possible. Articles should be written from an "in-universe" perspective as if they were written by a historian living in the DC Universe.