Explore the world's tallest skyscrapers currently under construction and their expected completion datesfind out what's rising next! One World Trade Center (center) in New York City is the tallest building in the Western Hemisphere.8 Spruce Street can be seen on the right. Dezeen has rounded up 15 supertall skyscrapers that are set to be built in cities across the globe, including a pair of twisting towers in Australia. From the Eiffel Tower in Paris, France, to the Taj Mahal in Agra, India, how many of these iconic buildings have you seen? Tallest in the World ; 138. Despite its tiny 25 ft.