Just a bunch of boulders on Mars?

Is it just a bunch of boulders? Perhaps, but if intelligent life exists on other planets, solar systems and galaxies, there are bound to be all kinds of ruins.
http://www.whatsupinthesky.com/index.php/2013-04-24-00-44-09/mars/907-amazing-pyramid-broken-wall-found-on-mars

For many it would be quite a shock to even discover various low-tech creatures.
http://www.whatsupinthesky.com/index.php/2013-04-24-00-44-09/mars/820-dinosaur-animal-or-just-a-rock

http://secretofmars.blogspot.com/2014/11/scientist-says-aliens-nuked-martians.html

Low-tech and high-tech tunnels are no surprise on earth...
https://www.youtube.com/watch?v=YHIBCBmC8k0
...but would be quite a surprise on the moon and Mars, etc.