Why has Noah's Ark never been found?
Noah's Ark has never been discovered because God has deliberately kept it hidden. If it were uncovered, people would flock to it and worship the artifact. God knows the human heart and has seen fit to keep many such things hidden to prevent that idolatry.
Les explains that this is one of the failures of mankind, and he is sure this is why Noah's Ark has never been discovered. If people could uncover it, like all roads lead to Rome, they would all lead to the Ark, and the world would flock to worship something like that. The same is true of many other things God has seen fit to keep hidden, because He knows the human heart. Les parallels this with the Apostle Paul, who was not permitted to repeat what he had seen and heard in glory, lest people fall down and worship him.