After a surprise visit to a controversial aluminium plant in the southern town of Gardanne, the 48-year-old Le Pen went on to lay a wreath at a World War II monument in the nearby port of Marseille.
Hours later, Macron, who if elected would become France's youngest president at 39, paid his respects at Paris's Holocaust memorial, where he was greeted by France's grand rabbi, Haim Korsia.
Eurosceptic leftist Jean-Luc Melenchon, who crashed out of the race in the first round, meanwhile, urged his supporters not to vote for Le Pen, saying that would be a "terrible error".
"I say to anyone who is listening: do not make the terrible error of voting for the National Front because you would push the country towards a general conflagration and the ending to which no-one can predict," he said on the TF1 television channel.
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