First, let me say that the "waterfall" is not a waterfall in the sense we normally think off. I believe it is the result of water seepage though, depositing minerals as it evaporates on exposure to the Martian climate, similar to structures created in limestone caverns.
To me, the most interesting find in this location so far is the Cross... I'll leave it to the theologians to discuss the implications.
The Cross
The Waterfall
There are other interesting images in this strip, and as they are enlarged and reasonably enhanced without hopefully too much distortion, I'll be adding them here as well. Like the following, from the same region, not sure if it's a city, or a strip mining operation. Click on the picture for a enlargement.
