Type: Mystic Realm
Environment: Essentially Earthlike
Usual Means Of Access: Magic
Dominant Lifeform: None
Prominent Inhabitants: None

Comments: The Citadel of Silence is an uninhabited city hovering "on the abyss between the What-Has-Been and the Never-Shall-Be". As such, it bears a striking resemblance to the Realm of the Beasts, but there is no evidence indicating that it is the same place.

First Appearance: AVENGERS ANNUAL #1