The document discusses the top 5 best buildings in the world. It describes the Hangzhou Bridge in China, which is the longest ocean-crossing bridge at 36 km long. It connects the municipalities of Jiaxing and Ningbo. It also describes Poseidon Undersea Luxury Resort, located in Fiji, as the world's first permanent seafloor structure. Additionally, it discusses Dynamic Tower in Dubai, the world's first rotating skyscraper designed by architect David Fisher. Finally, it mentions Hong Kong International Airport, located off the coast of China, which operates 24 hours a day and is the second busiest airport in the world.