Luis Enrique's men were 4-0 down from their first meeting in Paris and few gave them a chance ahead of Wednesday's clash, with no side ever overcoming a four-goal first-leg deficit in a Champions League or European Cup knockout tie.
But Barca somehow managed the seemingly impossible, with Neymar scoring twice after the 88th minute, before La Masia academy graduate Sergi Roberto fittingly secured Barca's place in history in the fifth minute of stoppage time.
And Bartomeu is adamant that the club's achievement will be remembered as one for the ages.
"This is a historic achievement that will be remembered forever," he said at full-time. "This will give us more energy in the Champions League."