The document lists and describes 9 unique building structures currently under construction around the world. These include Aqua in Chicago, known for its rippling balcony design; the Chicago Spire, which will be the tallest building in the Western Hemisphere; and CCTV Headquarters in Beijing, featuring an unsupported corner. The structures push design boundaries and include unusual shapes such as a jellyfish-inspired skyscraper and a building resembling a flame. The tallest, Burj Dubai, is expected to reach 818 meters once completed.