There is nothing that defines a city more than its skyline. While infrastructure takes many forms, a city’s skyscrapers are the physical manifestation of its economic and social power. At FutureStructure, one of the lenses through which we look at cities is called Soft Infrastructure – the intangible influencers such as regulations, education, laws, policies, human capital, research and even inspiration. Soft Infrastructure are the places new ideas start.

Everything starts with an idea. Over at there is a fascinating, largely visual look at eight of the most extreme skyscrapers ever designed. While such designs rarely make the leap from blueprint to reality, the do serve to inspire generations of architects and planners.

You can check out the 8 of the most astonishing skyscrapers ever proposed here: