NASA sure are tricksters all right. Whether its Moon or Mars, the cover up is essentially the same.
Here's an interesting lunar anomaly, courtesy ALSJ, Apollo 16 Pan Camera frame 4623:

Note the triangular shape, and especially the shadow being cast.
Here's the same enhanced a bit:
Below I have outlined, circled in red where can you find this anomaly in the original:
Original image:
http://history.nasa.gov/alsj/a16/a16.site-c.jpg