A year after Aizen's captured by the shinigami, he escapes! In the human world, people are getting killed by the hundreds. Everyone's in a panic. It IS Aizen doing the killing though, right?
Las Noches is a massive fortress which can be seen for miles in Hueco Mundo. It consists of a main building with a domed center surrounded by several large towers and smaller buildings. Atop the dome are six smaller towers (or as they appear), which seem to contain areas such as the Espada meeting hall.
The landscape of Hueco Mundo is a seemingly never-ending white desert, with dunes like those of the Sahara. The desert is littered with what appear to be boulders and shrivelled trees, but these are actually a form of quartz. In Hueco Mundo, the moon is on the opposite lunar phase of that in the Human world.
The Forest of Menos, introduced during an anime-only filler, is an area below the surface of Hueco Mundo's desert where the average Hollow hide from the Arrancar. Gillian- and Adjuchas-class Menos dwell here, along with possibly Vasto Lorde-class Menos. The forest is filled with large trees made of a silvery quartz substance. These trees extend to the surface and dot the landscape of the desert in Hueco Mundo.
