Historic National Prayer Service held at <a href="https://en.wikipedia.org/wiki/Washington_National_Cathedral" id="mwATM" rel="mw:WikiLink" title="Washington National Cathedral">Washington National Cathedral</a> for victims of the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/September_11,_2001_attacks" id="mwATQ" rel="mw:WikiLink" title="September 11, 2001 attacks">September 11 attacks</a>. A similar service is held in Canada on <a href="https://en.wikipedia.org/wiki/Parliament_Hill" id="mwATU" rel="mw:WikiLink" title="Parliament Hill">Parliament Hill</a>, the largest vigil ever held in the nation's capital.