The three-year-old British girl <a href="https://en.wikipedia.org/wiki/Disappearance_of_Madeleine_McCann" id="mwATo" rel="mw:WikiLink" title="Disappearance of Madeleine McCann">Madeleine McCann</a> disappears in Praia da Luz, Portugal, starting "the most heavily reported missing-person case in modern history".