During the 1960s moon missions Zeeman crater was photographed. An anomaly at the far edge of the crater slipped the censors eye and was later discovered by researchers outside of NASA.
NASA Censorship of Lunar Anomaly
The Anomaly is what appears to be a structure of apparent Intelligent design on the craters rim. NASA - in later imagery attempted to censor the image via obfuscation, as is evidenced by the image released years later in the lower right hand corner.
A Chinese probe of the area on the moons dark side may have revealed further data, however that appears to have been quashed by the Chinese Government, as no further information has been forthcoming other than the original curious article translated from Chinese by a poster at abovetopsecret.com
Chang'e Lunar Exploration: "found a mysterious object similiar to what NASA have found. Said to be some unbelievable object. The internal committee had a big disparity over this and those important national leaders have all came and viewed it. It is freaking/#ing astonishing, finally know what the # the Americans are afraid of. There are important figures who wants to reveal this finding but the forces that oppose this is huge as well."