Karakura City

Karakura City consists of very futuristic buildings, highways/skyways, parks, train systems and many other resources. There is also mostly Dome Shaped houses as you leave the city and head towards the housing area. The city is also protected by an invisible dome shield that is set to kill or injure most Arrancar or hollow's before they can even set foot in the city. Most low level arrancar or hollow's will be vaporized on sight once they touch it. Mid-level Arrancar or hollow can break a hole in the sphere, but it will quickly patch the hole and the authorities along with the Soul Society will be alerted instantly. And finally High-Level Hollow or Arrancar can easily sneak in as long as they don't unleash their reitsu. There is also beefed up shinigami presence in this district.