Location from Bleach by Tite Kubo
Aizen's colossal white dome fortress in Hueco Mundo, headquarters of the Espada and the Arrancar army he built to wage war on Soul Society.
Las Noches is architectural megalomania made real. Aizen built it to project power — every corridor is designed to disorient, every room scaled to make visitors feel small. The ten Espada each maintained private quarters that doubled as combat arenas: Szayelaporro's was a laboratory, Baraggan's was a throne room, Grimmjow's was barely furnished. The fake sky inside the dome was Aizen's cruelest touch — a reminder that he could create a heaven for beings born in darkness. The invasion of Las Noches forced Ichigo and his friends to split up, fighting through progressively stronger opponents in what amounted to a vertical power gauntlet. After Aizen's defeat, the fortress still stands, now occupied by Tier Harribel as the de facto ruler of Hueco Mundo.
A dome so vast it has its own artificial sky painted blue with clouds inside, making occupants forget they're underground. White walls and towers extend for miles. The interior is a labyrinth of corridors, throne rooms, and individual palaces — each Espada was given their own wing designed to match their personality. From outside, it looks like a smooth white hemisphere sitting on the sand, impossibly large.
Also known as: Las Noches, The Night Palace