This image, from the North wall of  East Ophir Chasma shows what appears to be nothing less, than a parked, oval shaped spacecraft!

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The object in question is almost dead center in the frame, indicating that it may have been the target of interest for this narrow angle shot. It is resting atop a ridge which displays unusual (except for Mars!) geometric structure. The ship itself seems to be covered with a thick coating of dust, but it is clearly a nearly perfectly symmetrical oval shape, with a number of distinct features, including a angled front wedge, rows of parallel "windows," a faintly hexagonal cell structure in the roof, and a "hatch."

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And it's only 3,000 feet long ...