I think on one of the lists I mentioned a DANIEL BOONE ep in which the heroes come across a valley of dinosaur bones which they use to put across the illusion of a dragon.

Add to that a 1965 episode, "The Mound Builders," in which Henry Silva plays the survivor of a lost Aztec city who enlists Dan'l's help to find some treasure in hostile Shawnee country. Naturally, one never sees the lost city, but that's a fantasy-trope worth including on the list.