There is a Mars-ic fringe of the UFO-scene. They scan all the pictures published by NASA, enlarge them, enhance them, mirror them and do all other kinds of processing searching for signs of intelligence. For instance see this picute of a city on Mars. They (both the people and the pictures) are not very convincing to others outside of that scene.

I'm with Sagan on this question who once said regarding the now much less popular canals on the Mars:

Lowell always said that the regularity of the canals was an unmistakable sign that they were of intelligent origin. This is certainly true. The only unresolved question was which side of the telescope the intelligence was on.

Wolfgang