Introduction to the 21st Century Oasis: The 21st Century Oasis (Oasis21) is located in Naka-ku, Nagoya City. It is a three-dimensional multi-functional public facility for transportation, shopping, exhibitions, and entertainment composed of underground, ground, and air. It is a symbol of the prosperity of Nagoya. A new symbol of prosperity and a new landmark. Among them, the design of the aerial part is particularly clever and unique.