There was a book in the wild stuff rack, back in the mid-1970s, that alleged that there was massive construction projects on the lunar surface — and even had a huge section of photos purporting to show it. Look, an “earth”-moving machine 3/4 of a mile long! Right here, where we drew the arrow! And there was literally nothing there. Figured it was a spoof, but it wasn’t presented that way, and now I really wish I’d bought the thing. :’)
The book I have is actually somewhat convincing...”We Never Went To The Moon” by William Kaysing and Randy Reid.