Another conspiracy theory is that they went to the moon and found that their is an alien base up there and the aliens were monitoring the moon landings. Apparently there are radio recordings of Armstrong describing the massive size of their ships. Apparently the following Apollo missions were quick visits, as the aliens didn't want them up there, probably bollocks, but who knows?
My problem with the moon landings were how they got through the Van Allen radiation fields around the earth? Conspiracy theorists say the ships and suits they travelled in offered little protection from the powerful radiation. Don't think we'll ever know the truth.