Windowless Building

The Windowless Building is a tall structure where Aleister Crowley resides in. From the outside it has no windows or doors and entry to the building is only possible by certain teleporters such as Musujime Awaki. The building can produce it's own oxygen, and is designed to be able to withstand nuclear attacks. Awaki also claims that it can block radiation from space, she also theorizes that the Windowless Building has other defenses inside, as she is certain that Aleister would not create such a formidable building, only to make it accessible to any teleporter with the skill to enter it. The structure also helps support Aleister's life. The building is protected by some unknown measure or force strong enough to destroy a concrete wall (its a building in the anime) that Accelerator threw at it, along with the force of five minutes of the earths rotation. Aleister's room appears to be quite advanced, having numerous display screens that seem to appear out of air.