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Gizmodo - Looks Like the Entrance to an Alien Tomb.
NASA Link 1.
NASA Link 2.
NASA Link.
NASA Link 1.
NASA Link 2.
NASA Link.
Go just a few frames to the left on the the Sol 3466 07:59 listing and you will encounter the shot published above, that has a carved rectangular outline of similar size and shape which tends to support the veracity of the original image .. maybe it is a tomb that failed to find a buyer and was never completed.