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They used to reside there with their army of Arrancar complete with medical facilities and detention wings. This was also Baraggan Louisenbairn's castle when he was still the King of Hueco Mundo, and he would station his army of Hollows here. However, during Baraggan's reign it had no roof or walls. Indeed, Baraggan scorned at the idea of a roof claiming that as he was the King of Hueco Mundo, its sky was his ceiling.

Las Noches is a massive fortress which can be seen for miles. It consists of a main building with a domed center surrounded by several large towers and smaller buildings. Atop the dome are five smaller towers, which appear to contain areas such as Aizen's throne rooms and the Espada meeting hall. In the room where Orihime Inoue is kept, there is one large Middle-Eastern rug on the ground that is facing outside, much like those in rooms used for Islamic prayer. Like everything else in Hueco Mundo, the main building is colored white.

Las Noches is an exceedingly large structure, appearing as large as (if not larger than) the Seireitei in Soul Society. Due to its immense size, Ichigo Kurosaki once speculated that it could be an illusion as he, Yasutora Sado, and Uryū Ishida did not seem to make any progress getting closer to it, despite running until they were exhausted. Also, according to the Arrancar Nelliel Tu Odelschwanck, it takes about three days to move from one spot to a gate.

The inside of Las Noches' dome simulates the blue sky of the Human World, which Aaroniero Arruruerie claims is so the light of the sky will help Aizen observe anywhere he wishes. However, since Aaroniero must stay out of the sunlight to use his abilities, Rukia Kuchiki speculates this is a lie. The position of the halls within the palace can also be adjusted, allowing the one operating them to direct the movements of intruders.

Due to their immense power, Espada ranked four and above are forbidden from releasing their Zanpakutō within Las Noches. It is also forbidden for any Espada to use a Gran Rey Cero inside Las Noches.

Seventeen months after Aizen's defeat, with the Wandenreich conquering Hueco Mundo to conscript strong Arrancar for their army, Las Noches has sustained significant damage with more than half the fortress left in ruins. The first Jagdarmee of Wandenreich seems to have made a camp here.