Tenkū no Shiro (天空の城, literally meaning "Castle in the Sky"), or Laputa (ラピュタ) as Shuren calls it, is an architectural wonder within the Vizard Hideout. The Headquarters is called "Castle in the Sky" and it was built on the roots and trunk of a humongous floating tree. The Fortress has a self defense mechanism: when somebody is around the Fortress, it creates a storm around the whole structure. If the visitors are considered to be hostile the storm forms around the entire structure with a tremendous force. If not, then the storm becomes pretty easy to pass through.

History of Laputa:

Shuren: "You are... gods."
Projection: "No. Not gods. We simply came... before."
―Shuren discovering the message left by a scientist of the First Civilization.

The Castle in the Sky, or Laputa, was actually not built but found by Shuren and his followers. It was originally built by a group of people called the First Civilization. It was an ancient species of humanoid souls that were among the first to call the world their home. They were responsible for the creation of Laputa. But the society of this civilization wasn't a stable one. Eventually, war broke out between the First Civilization and their then unoppressed members; this, coupled with the onset of what would be referred to as the "Toba catastrophe", an aerial disaster that destroyed almost everything on Laputa, would see the First Civilization slip into extinction. While both sides survived the catastrophe, few of them remained. Working together, they rebuilt their Castle in the Sky. Despite their survival, the First Civilization was unable to fully recover their numbers, and began an inevitable decline toward extinction. Despite this, their legacy lived on.

Primary Locations:
Despite being called a Castle, Laputa actually looked like a huge island floating in the sky, thus having more than just the building of headquarters, which included: the runway for arriving, the runway for leaving, the Throne Room, the Center Plaza, the Garden, the Laboratory, the Mission Room, the Sky Observatory, the Storm Room, the Control Room etc. Besides these, the building used as the Headquarters was built many centuries ago by the creators of this magnificent structure, along with the whole island.
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The Throne Room is located at the Fortress, which stands at the highest point of the flying island. The first thing to notice is the enormousness of the room. The hall leading to the throne is unusually large and the sunlight are refracted from the dome, which illuminates the throne. The architecture is old, yet formidable. The throne is made of many over-sized senbons, metal needles with a point at both ends. These senbons are modified to enclose on anybody, aside from Shuren, who tries to sit on the throne. The ground, on which the throne stands, is surrounded by columns. As for the Fortress, it contains many halls, chambers and rooms designed for different purposes. The entrance of the Fortress leads to the Throne Room, however it is possible to travel through corridors and explore different parts of the structure.
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The Center Plaza is the meeting place of the inhabitants. The plaza consists of many trees and a pond, which makes it resemble a park. However, it has been partially renovated to a more western looking place. The renovated area has a fountain with a woman figure in the middle. There are also banks for people to sit and relax, overlooked by the streetlights. The rest of the plaza was left as it originally was, since Shuren also wanted some of the original structure and architecture of the island to remain. This ended up with the Plaza being divided into three main parts: the Outer, the Central and the Ancient.
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The Gardens are Laputa's main source of food. They provide countless fruits and vegetables, thanks to the greenhouse in its innermost area. The island also offers unearthly fruits and high calorie treats. Fruit pies are common treats among the inhabitants.
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The Laboratories is the main location used for scientific purposes. The rooms and their concept weren't changed, as the original builders of the island possessed more advanced technology. The devices are intertwined with various trees and plants. These devices are also used to heal wounded or diseased people. The healing techniques, however, mainly focus on speeding the healing process up rather than trying to tackle the problem.
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The Sky Observatory, unlike its name suggests, is the guard tower that watches the surroundings of Laputa. Any unknown objects or seemingly threats are immediately reported to the Storm Room.
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The Storm Room and the Control Room are the panel rooms where certain activities within and around Laputa are watched, controlled or manipulated. The control room possesses the tools and gadgets to control and observe Laputa while the storm room exists for the sole purpose of creating storms around the Laputa when an unidentified object, person or vehicle advances towards the island or when a threat is present. These couldn't be done without the reports from the Sky Observatory of course.
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The Library and the Archives were built by The First Civilization, with the intention of preserving all the world's knowledge. With time, it eventually held a vast, ancient collection of books. At one point in time, the library was accessible to visitors, as the ancient settlers hoped they would benefit from the vast amount of information. However, some people sought secrets that would destroy their enemies. Angered by the abuse of this knowledge, the ancient rulers of Laputa closed the library. Eventually, the location of the library along with the location of the floating island was lost to others. Though the building of the library is the size of a large building, most of it lays buried beneath the ground, with only its topmost spire visible from above ground. Many years later, the library was found and discovered once again by Shuren. Now that they are updated every single day, it is possible to find books about any topic.
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