The Interdimensional Travel Station (ITS) is a location within Void City that serves as a central gathering hub for Dimension Island. It has been shown to have many similarities to train depots. The permanent links to and from other dimensions are housed here in the form of portals. It is also one of the most common locations for characters to first arrive in. A common theory to explain this is that the number of portals have weakened the Island's dimensional barrier, although some would argue that's why the ITS was placed in this location to begin with.