A few days ago, some guy was looking through mars using google earth, and he claims to have found some kind of building. He's pretty sure its a quite large building 700 feet long and 150 feet wide. He claims it has to be a manufactured structure because its clearly not a rock or a mountain. See for yourself:

I think its probably bullshit to be honest. I mean, if it would be a big conspiracy that NASA put it there, they definitely wouldnt make it visible on google earth would they? Let me know what you guys think. If you want to look up the building yourself, typ this in google earth: 71 49'19.73"N 29 33'06.53"W