This sustainable skyscraper isn’t just green on the surface as shown by the living wall in the image above – it also incorporates numerous photovoltaic panels, natural ventilation strategies, and its own biogas generation plant. One of the neatest aspects of this design is the way it invites the public up to experience the building’s greenery via exterior walking paths that also serve to provide access to restaurants and other publicly-accessible program elements lining one side of the tower. (Source)