Las Noches

Las Noches during the time of Baraggan Louisenbairn.

They reside there with their army of Arrancarcomplete with medical facilities and detention wings. This was alsoBaraggan Louisenbairn's castle when he was still the King of Hueco Mundo.^[1] 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.^[2]

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 room and theEspada 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 easily the largest structure in the Bleach universe, appearing as large as (if not larger than) Seireiteiin Soul Society. Due to its immense size, Ichigo Kurosaki once commented that it could be an illusion as he,Chad, 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 living world and Soul Society, 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. Since Ichigo was able to break through the dome and escape to fight Ulquiorra, it's more than likely that the area under the dome is likeUrahara's training ground, due to the sky and seemingly endless plains. 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 cuatro 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. It is later justified by the battle between Ulquiorra and Ichigo, as their fight above the dome resulted in Las Noches losing a good portion of its domed roof, as well as segments of the five towers.

Las Noches Locations

Illustrated Guide to Las Noches
Entrance	Cirucci Sanderwicci's area	Dordoni Alessandro Del Socaccio's area	Gantenbainne Mosqueda's area
Tres Cifras (三桁の巣 (トレス・シフラス), Toresu Shifurasu; Spanish for "Three Figures", Japanese for "Nest of Three Digits") is a part of Las Noches where the Demoted Espada, or Privaron Espada, live.
Tier Harribel's Palace	Szayel Aporro Granz's Lab	Aaroniero Arruruerie's Palace	Nelliel Tu Odelschwanck's former residence
The Palace of the Espada
Throne room 1		Throne room 2
Sōsuke Aizen's rooms, located in the 5th Tower of Las Noches[3][4]
Kaname Tōsen's Control Room		Gin Ichimaru's Control Room
Control Rooms
Orihime Inoue's Cell		Espada Meeting Room
The room in which Orihime was kept.		The room in which the Espada hold their meetings.