Much like unwelcome guests a maze of extradimensional vault doors protect some of the more dangerous mystic artifacts in Strange's collection. If placed inside a mundane building Strange’s Vaults  would be twice the size the Sanctum.

The hall and walls of the Vaults move under their own power; the Vault Hall shifts and folds to bring the patron and desired vault together within.

Occult Artifacts in the Vault


Marvel Database- Sanctum Sanctorum article-

Wikipedia Sanctum Sanctorum article-

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