Noah's Ark

The Ark's Origin
Noah's Ark is the vessel, which, according to the biblical story, was built by Noah 7,000 years ago at God's command to save himself, his family and the world's animals from the great flood that God had created to wipe out all life on Earth after viewing the wickedness of mankind, sparing only Noah and his loved ones after seeing Noah as a righteous man. It is a large white cube-shaped structure that contains a white mediterranes city comprised of white buildings and tower at the center looming over the rest of the city, which contradicts the normal idea that the ark was a vast boat. The ark was used by Noah and his family to create the second generation of humanity as told by members of the current Noah Family. The ark uses trans-dimensional technology to travel in between dimesions and to create gates that allow access to and from the ark itself. Affter the events of the great flood the Ark has been used by the Noah Family for generations. When the Millenium Earl came into contact with the family and allied himself with them he had the Akuma Egg, the device he uses to manufacture Akuma moved into the ark, where it had remained ever since, until the Black Order's assault on the ark that ended with the order taking control of the ark.

The Change Between Arks
After the failed rebellion of the 14th member of the Noah Family during which he had apparently used the Ark, the Millenium Earl fearing that the 14th had left some sort of trap within the vessel had decided that the ark was "faulty" and had begun construction of a new ark. This new ark is identical to the original with the only known difference being cosmetic; the original ark is white whilst the new one is black. The Earl had planned to download the contents of the original ark into the new one while at the same time destroy the structure of the original ark in order to ensure that it would never be used against him. Road Kamelot, the first child of the current generation of the Noah Family assisted the Earl with this task by reprogramming the original ark to prepare it for the download.

However, the Earl's plan to replace the orignal ark failed as the 14th had indeed left behind a way to take control of the ark away from the Earl. When Allen Walker had found himself within the secret room of the fourteenth within the original ark there was a piano that could override the commands of the Millenium Earl and Road Kamelot. Once Allen had commanded the ark to cease the download, it obeyed his command and restored itself.

The Two Arks
There are two arks. The original ark belongs to the Black Order since Allen rescued it, as it became "faulty" after the 14th Noah used it. Although anyone in the order can walk into it, only Allen can create gates at will and step into the ark wherever he wishes. The gates he create can be used by anyone else afterwords.

The second ark was created by the Millenium Earl after he downloaded the original ark into the new form. This downloading was mostly the effort of Road, though the Earl playing the organ most likely was necessary as well. The new ark was created because the old ark became "faulty" after the 14th used it.

Controlling The Ark
The original ark could be controlled by the Earl, Road, and the 14th. During the Noah's ark arc it is revealed that Allen Walker has been given the "licence" to play the arc by the 14th (due to the 14th placing his memories in the boy). It is currently being controlled by Allen, though it unsure if Road and the Earl may have some ability over it should they enter the piano room. The Earl's new ark has been used by Lulu Bell, but it is unclear if it is because she can use it at will, or if the Earl or Road helped her.

Gates created from the ark have numbers on them seeming to be in the order of the gate's creation. After Allen takes controll of the old ark the gates have turned white (from the original black colour) and have begun re-numbering themselves from 1 (though gate 1 is not seen it may have been the first gate to Edo or from the piano room. The gates appear as a 2D crystal like doorway outside the ark and a regular door in the white city located inside the ark.

WARNING ! The following is pure speculation and should not be treated as concrete facts! It could be, that the Ark itself, is a dimension, with doors that open out into other dimensions, and doors that open into other worlds, and that the cube like form of the Ark, is nothing but another door of the true Ark, which could be humongous it size.