Is something on the Moon?
I think there is a reason why man has not been back. We were warned not to by something else all ready occupying it.
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So many moon theories to choose from:
1. Moon shots/landings are all authentic/real.
2. " " are all fake except the first one.
3. The first one was real, but the "televised" footage was fake - the other photos were all fake because, although we may have low-orbited earth, we never went back to the moon. That may be why their had only been ONE SINGLE "earth from space" photograph ("the Beautiful Blue Marble") until July 2015...whereas if we were really that deep in space and/or on the moon taking pictures, there ought to have been hundreds, if not thousands of "earth from space" photos.
[4. The ISS is a real machine in space, but the inside photography is a combination of green screen and gravity-free photography done on some iteration of the "Vomit Comet".]
5. The first landing discovered alien artifacts and flying craft and this was our "warning" not to return.
6. The Van Allen Belt radiation was simply too strong for our technology - we couldn't send men thru it and keep them alive, and safety-coating the capsules was too difficult and expensive - so all moon flights were fake, and photography "from the moon" was fake, although photography from near-earth orbit could be real.
7. The earth is really flat and/or an enclosed system (like Genesis' flat earth covered by a water-yielding dome called "the Firmament"), but "the Powers" ... (the .1% wealthy, the military/industrial/corporate Complex/the Royals/Science ... all have too much investment in the round earth model of a planet among billions hurtling thru space - and therefore cancelled all moon flights, faked the ISS and moon-and-space photos in order to "keep the round earth round and hurtling through infinite space".
8. The moon and sun are both artificial flat bodies only 350 or so miles away from the flat earth, operating on "refresh" commands in a computer program - if true, it's obvious that there is no spherical moon on which we could land.
... etc.
To answer your question directly, I don't know if we found "something" on the moon that prevented us from going back. My optimism says that if we found evidence of alien intelligence/artifacts/civilization, we would have proudly broadcast the news to the world and the scientific community. But because we did not do so, we probably discovered nothing like that on the moon. My pessimism says that maybe we found something so .... TERRIBLE ... on the moon, we kept silent - or that maybe what we found on the moon put a metaphorical gun to our head, bullying us into saying nothing about its presence... I just don't know...