This is the famous Karakura Town, just like any town it has a hospital, school and just about anything else you would suspect from a Town. The only thing that is unsespected would have to be how High Reaitsu gathers around here. This causes Hollows to gather around here more often then anywhere else in the planet. (Except for Hueco Mundo)
This is where most of the Vaizards go, they also use this place as their Head Quarters. This place is hidden from Shinigami by being cloaked of Reaitsu making it pretty much invisible to Shinigami.