The Ultima Tower, also known as the Two-Mile-High Tower, is a visionary skyscraper unveiled in 1991 by the architect Eugene Tsui to be built in San Francisco in the US.

It is meant to be highly resistent against earthquakes (as San Francisco has strong seismic activities), and meant to be 3,218 meters tall, the tallest skyscraper ever envisioned for about a year, being ultimately beaten by the Tokyo Tower of Babel in 1992.

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