These are chambers on both Kwaon and Diana and that allowed for instant transportation to Altostratus pods that are located on the edges of Nimbus plains.
A giant, practically indestructible, pillar that holds elevators, escalators and staircases that go either up or down into/out of Madcross into/out of Kwaon. This is the tallest building reaching the bottom of the ocean to shore of the island.
A cavern from Agritera to MadCross that starts out as a typical cave and eventually becomes more technologically based as it enters MadCross territory. This is rather large cave and is quite the walk.