SUPERTALL! is an international survey of superlative towers featuring projects that have been completed since 2001, are under construction, or are expected to top out by 2016. This recent generation of giants, generally 100 stories or higher, represents a new paradigm of slender mixed-use towers that explore innovative approaches in engineering, curtain-wall and construction technologies, energy efficiency and sustainability, and concepts of vertical communities. To distinguish the rarified air of the super- from the merely very tall, the Museum made the benchmark 380 meters/ 1,250 feet-the height of the Empire State Building-rather than the common standard of 300 meters. Worldwide, 48 projects measure up, including six towers of 600 meters or taller, six of 500+ meters, and twenty-four exceeding 400 meters. The world’s tallest building, Burj Khalifa, rises 828 meters/ 2,717 feet above the sands of Dubai. It will hold the record for at least five years- the typical time it takes to construct a supertall.