Fortress of Knowledge
Fortress of Knowledge
Location United States
Use(s) Stronghold
Owner(s) Maddox King/Sovereign

The Fortress of Knowledge is Maddox King/Sovereign's Kryptonian stronghold located in the Rocky Mountains of the United States. It also serves as a repository for all the knowledge of the Kryptonians, including that of their now-destroyed homeworld of Krypton.


The Fortress of Knowledge is a vast sanctuary hidden somewhere in the Rocky Mountains. It appears to be built from either Crystaline Stone. The facility was maintained by a Kelex, who recognized Maddox, Kal-El and Kara Zor-El as well as certain friends such as Barry Allen and Lyla Michaels as friendly, but maintained defensive programming against strangers such as Saracon.

Known holographic entitiesEdit

Known visitorsEdit