What is the meaning behind the trip to Eldorado?

Candine wants to marry Cunégonde. The baron insists that his sister will never marry a commoner. Candide is furious and thrusts his sword into the baron.Candine and Cacambo escape into the wilderness and stumble on Eldarodo a few days later. Eldarado is a utopia of sorts where gold and Jewels line the streets. Eldarado is a legendary city or historical region of the New World, often thought to be in South America, that was fabled for its great wealth of gold and precious jewels and eagerly sought by 16th- and 17th-century explorers, including Sir Walter Raleigh.