The Basilique Ste-Madeleine (Basilica Church of St. Mary Magdalene) in Vézelay is the largest Romanesque church in France and only 10 yards shorter than the Notre-Dame Cathedral in Paris. As it claimed to guard the relics of St. Mary Magdalen, Vézelay was a major medieval pilgrimage destination. It also saw the launch of the Second and Third Crusades.

see wikipedia : http://en.wikipedia.org/wiki/V%C3%A9zelay_Abbey