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The modules would have standardized utility ports so as to be completely livable within minutes of arrival, and could be subsequently detached and moved to other such cities.ДЄ number of theoretical structures have been proposed which may be considered megastructures.

Fuller also proposed a marine analog consisting of a hollow terraced floating tetrahedron of reinforced concrete measuring one mile from vertex to vertex supporting a population of one million living in air-deployed residential modules on the exterior with the requisite infrastructure providing utilities (water, power, sewerage, etc.) inside. Cloud nine is Buckminster Fuller's proposal for a tensegrity sphere a mile in radius which would be large enough so that it would float in the sky if heated by only one degree above ambient temperature, creating habitats for mini cities of thousands of people in each 'Cloud Nine'.The highway would network new and existing bridges and tunnels, improving not only ground transportation but also potentially offering a conduit for utility pipelines. Trans-Global Highway, highway systems that would link all six of the inhabited continents on Earth.Atlantropa, a hydroelectric dam to be built across the Strait of Gibraltar, lowering the surface of the Mediterranean Sea by as much as 200 meters.Networks of roads or railways, and collections of buildings (cities and associated suburbs), are usually not considered megastructures, despite frequently qualifying based on size. The Large Hadron Collider consists of, among other structures, a ring 27 kilometers in circumference.(See the List of tallest buildings and structures in the world and list of largest buildings in the world.) Skyscrapers represent the current state-of-the-art in large structure engineering.

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The Rice Terraces of the Philippine Cordilleras, a 10360adj=onNaNadj=on sprawling agricultural landscape carved in the mountains by free tribesmen of Ifugao some 6,000 to 2,000 years ago.

The Great Wall of China is a human-built megastructure, a few meters wide and 3947miles in length, about 4975318yd2.

There are structures that may be considered megastructures, such as Some of the more notable such architects and architectural groups include the Metabolist Movement, Archigram, Cedric Price, Frei Otto, Constant Nieuwenhuys, Yona Friedman, and Buckminster Fuller. Many architects have designed such megastructures. Other sources define a megastructure as 'any development in which residential densities are able to support services and facilities essential for the development to become a self-contained community'. This type of framework allows the structure to adapt to the individual wishes of its residents, even as those wishes change with time. In 1968, Ralph Wilcoxen defined a megastructure as any structural framework into which rooms, houses, or other small buildings can later be installed, uninstalled, and replaced and which is capable of 'unlimited' extension. Megastructures often play a part in the plot or setting of science fiction movies and books, such as Rendezvous with Rama by Arthur C. Such arcology concepts are popular in science fiction. Megastructures are also an architectural concept popularized in the 1960s where a city could be encased in a single building, or a relatively small number of buildings interconnected.

Those that could be constructed easily qualify as megaprojects. This makes their design examples of speculative (or exploratory) engineering. Most megastructure designs could not be constructed with today's level of industrial technology. The lower bound of megastructural engineering might be considered any structure that has any single dimension 1 megameter (1000В km) in length. The products of megascale engineering or astroengineering are megastructures. Some sources define a megastructure as an enormous self-supporting artificial construct.

Some apply the term to any especially large or tall building. A megastructure is a very large artificial object, although the limits of precisely how large vary considerably.

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