Millennium Gate
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The Millennium Gate was a 21st century structure, and Earth's first self-sustaining civic environment.
Built in the state of Indiana in the nation United States, its construction was complete around 2012.
One kilometer high, with a base of 3.2 kilometers, this structure could be seen from space.
Covered in highly-reflective solar panels, the Gate was a self-contained biosphere, even processing its own ecosystem.
Equipped with over six-hundred stores, this feat of architecture served as the model for Mars' first Earth colony.