Architecture The MIllennium Gate The Millennium gate, a structure built on Earth in the early 21st century. The gate was built in the United States of America and was one of the few objects which could be seen from orbit with the naked eye. It was 1,000 metres tall and 3,200 metres wide at the base. The surface covered with highly reflective solar panels to provide power, and the interior was a self-contained ecosystem. [1] Architecture entry
