Many Conspiracists believe Area 51 to be the ACTUAL "Poto-shoot" area that was used to fake the Moon Landings. I have seen those debunking shows on Fox using comparative photos from Apollo and Area 51 (allegedly) and true they were eerily similar.
What I don't believe though is that 40 years have passed and no one ever flattened that area to hide the reenactment area.
But, if newer construction, different crater layouts to represent different landing areas of the moon (and with the right filters on the camera, Mars) then surely it could be a PRACTICE AREA for the REAL THING - nothing better than a full scale simulator to practice on, whether in the near future flights or the ones of 40 ears ago!!!