Mastcam: Right 2014-08-05 13:28:38 UTC – Original Image from Mars Rover Curiosity at Hidden Valley
This is the image where the tomb found by S. Waring is, however, there is whole lot more within this image than the tomb. The first thing that caught my eye was a sea turtle in the upper left hand corner, near it a rectangle (engineered looking) stone with a circle on it and a rock with an inlaid 90 degree angle at the bottom right. After looking longer I have found other items and every time I look at the image more things pop out at me.
Additional items found in the image are below: