Liverpool produced one of the greatest Champions League comebacks by overturning a three-goal first-leg deficit to beat Barcelona 4-3 on aggregate and reach the final.
After losing 3-0 at the Nou Camp, the Reds made the ideal start to this game when Divock Origi tapped home.
Georginio Wijnaldum scored twice in two second-half minutes to level the tie.
Origi then swept in a fourth from a clever corner routine to complete a remarkable victory.
Liverpool will play either Ajax or Tottenham in the Champions League final in Madrid on 1 June.
It was deja vu for Barcelona, who were beaten 3-0 in the second leg of their Champions League quarter-final with Roma last year to exit the competition on the away goals rule, having won the first leg 4-1.
But for Liverpool it was another memorable European comeback that ranks alongside their victory against AC Milan in the 2005 final and their 4-3 win against Borussia Dortmund at Anfield three years ago.