(From Wikipedia) A domed city is a kind of fictional structure that encloses a large urban area under a single roof. In most descriptions, the dome is…see more

(From Wikipedia) In science fiction, floating cities are settlements that strictly use buoyancy to remain in the atmosphere of a planet. However the…see more

(From Wikipedia) In physical cosmology, astronomy and celestial mechanics, anti-gravity is the idea of creating a place or object that is free from…see more