The Gwanggyo Power Centre is a concept city that is meant to resemble hills. If built the concept city is able to sustain a population of 77,000. The city of Gwanggyo is located near Seoul, South Korea. Dvice says that every structure in the city "will be terraced with plantations, watered by a floor-to-floor circulation system." So the city will have real greenery in addition to being self-sustaining. You can read more about the futuristic concept here on Jetson Green.
