The clock tower at the <a href="https://en.wikipedia.org/wiki/Palace_of_Westminster" id="mwew" rel="mw:WikiLink" title="Palace of Westminster">Houses of Parliament</a>, which houses <a href="https://en.wikipedia.org/wiki/Big_Ben" id="mwfA" rel="mw:WikiLink" title="Big Ben">Big Ben</a>, starts keeping time.