A Giant lunar Tower-"Shard", photo taken by the Lunar Orbiter.
Its a most famous and debatable photograph on internet. Its clearly showing a big structure on lunar surface having a spindly shaped. We can see the nodes and constrictons on the body. No known natural process can explain such a structure. It's difficult to believe such things are on the moon.
Any one can download that image from the link lunarorbiter/frame/?3084
More Evidence Of Lunar Towers-