Forbidden Fortress

From Lexicanum

The Forbidden Fortress is a remote complex on Terra, and is the base of the Astronomican and Adeptus Astronomica, incorporating the Chamber of the Astronomican. The Fortress is built within the Himalayas. To outside appearances the mountains remain unchanged by the hand of man but in fact the Forbidden Fortress extends deep down into the rock and throughout the entire mountain range. Uninvited access to the Fortress is not permitted - even members of the Arbites and the Inquisition must seek permission before they can enter.

Sources

• Codex Imperialis (Warhammer 40,000 2nd Edition)
• White Dwarf 140, Jervis Johnson, Andy Jones, Simon Forrest & Rick Priestley
• Inquisition War Trilogy (Novel Series), Draco