In the city that never sleeps, one architect's dream for a greener future has been realized. National Geographic provides an exclusive look at the design and construction of an eco-friendly marvel: One Bryant Park, set to be the second tallest building in New York City and one of the world's most energy-efficient skyscrapers. Follow architects and engineers as they take a modern approach to green technology, incorporating innovative new systems - including an on-site power plant - that will reduce the building's energy consumption by 50 percent. Then go behind the scenes with construction workers as they build the skyscraper - whose blueprints could map out a new design for our planet's future.