In Holes, what surprising thing did Stanley find out about his stay at Camp Green Lake?

Stanley finds out many surprising things during his stay at Camp Green Lake. He learns that the true purpose of the camp is to search for buried treasure in order to make the Warden rich, but this is not the most surprising thing. Perhaps the most surprising is the revelation of his own family’s history.
At the end of the novel, Stanley finds a suitcase full of treasure, worth quite a large sum of money. This trunk belonged to his ancestor, who had become wealthy in America only to have his money stolen and lost in the middle of the former lake, Green Lake. Generations of his family would be cursed with bad luck until a member ritually carried Madame Zeroni (or her descendant, Hector) to the tip of a mountain. When Stanley completes this task inadvertently, their fortunes are reversed, and Stanley discovers the treasure, unraveling the thread of his family history.