Construction of the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Campanile" id="mwJg" rel="mw:WikiLink" title="Campanile">campanile</a> of the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Cathedral_of_Pisa" id="mwJw" rel="mw:WikiLink" title="Cathedral of Pisa">Cathedral of Pisa</a> (now known as the <a href="https://en.wikipedia.org/wiki/Leaning_Tower_of_Pisa" id="mwKA" rel="mw:WikiLink" title="Leaning Tower of Pisa">Leaning Tower of Pisa</a>) begins; it will take two centuries to complete.