Sci-Fi Cities are somewhat-uncommon colossal-sized futuristic cities that naturally generate in Taigas, Swamps, Forests, Plains, Savanna, Mesas, and Deserts. They are the largest ever naturally-generated structures of Minecraft, being either two times bigger or three times bigger than Vampire Castles, so Mojang took more than 5 years to make these massive structures, so they are the most complicated structures ever made for Minecraft. They look like what the future cities would look like in…