Recently a picture from the Mars rover, Curiosity, had what appeared to be a block shaped object in the distance. UFO enthusiasts claim it to be a coffin. The image is quite grainy (like every other image that has ever been claimed to have evidence of extraterrestrial life) so it cannot be certain it is a coffin or even an unnatural object. In all reality, it is probably just a rock formation. It is indeed worth a trip back to that area, though, to see what it really is. I have posted the image below so you can decide for yourself.
If you would like more information, you can visit Tech Times’ article on it.