Sanctum Sanctorum

The New York Sanctum is one of the three bases of the Masters of the Mystic Arts alongside the London Sanctum and the Hong Kong Sanctum. Located in New York City, it is used to store and secure mystic items such as the Dark Scepter and the Cloak of Levitation. The current master of the Sanctum is Doctor Strange

The Sanctums are the protectors of our world, any magic threat that comes to take it over can be stopped by these. If all three are destroyed then havoc will come usually started by the great Dormammu who has wanted to take over for decades now