Answer:
The pursuit of a mythical and elusive place of wealth and happiness.
Step-by-step explanation:
The theme of the poem "Eldorado" by Edgar Allan Poe is the pursuit of a mythical and elusive place of wealth and happiness. The narrator, a knight, has spent his life searching for this place, called Eldorado, but has grown old and weary without finding it. In the end, he meets a pilgrim shadow who tells him that he must "ride boldly" over the mountains of the moon and down the valley of the shadow in order to reach Eldorado. The poem suggests that the search for happiness and fulfillment is a difficult and sometimes perilous journey, but one that is ultimately worth pursuing.