Funny you mention that. I just found what looks like an artificial artifact on Mars while browsing through images taken by the NASA's Perseverance rover.
It looks like a plate with something in it (see top image)? You can view the original image here at position 34:22 on the youtube video. Just go into full screen mode and look near the bottom left corner of the frame (see top snapshot below).
That same image also has a rock near the top left corner of the frame with an artificial U shaped hole or slot cut into it. (see bottom snapshot below).
There is also a large area left blank to the right in the frame? Maybe there is something artificial there also that they don't want you to see?
