Construction begins on the <a href="https://en.wikipedia.org/wiki/Gateway_Arch" id="mw2Q" rel="mw:WikiLink" title="Gateway Arch">Gateway Arch</a> in <a href="https://en.wikipedia.org/wiki/St._Louis" id="mw2g" rel="mw:WikiLink" title="St. Louis">St. Louis</a>, <a href="https://en.wikipedia.org/wiki/Missouri" id="mw2w" rel="mw:WikiLink" title="Missouri">Missouri</a>.