Linked without comment, unless you're a fan of Richard Hoagland:

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Probably just rubble.Those little serrations within the crack or ditch around the outside of the "bear's" head are interesting.
The energy source would be internal planetary heat. The sun is at best irrelevant.Hummm.... beary inderesding
Likely place for organics I'd look for on Mars would be underground caves near equator that are protected from radiation.
If a civilization needed to survive on Mars after a calamity they'd likely resort to a strategy similar to Derinkuyu.
Maybe humans come from Mars... lived underground for millennia until it was decided to migrate to earth
Lol, must be a charlatan like Brandenburg or Hoagland. Mars is a paradise alright, for those who like -100 F or lower temps and deadly radiation.One of the ancient astronaut writers said something about the Garden of Eden being on Mars.
We'll get to Mars, in pursuit of more realistic objectives.We need to get our arses to Mars to find out.
…in the billion years when water flowed on mars.Lol, must be a charlatan like Brandenburg or Hoagland. Mars is a paradise alright, for those who like -100 F or lower temps and deadly radiation.
it’s a thought experiment.Any civilization or race incapable of living on the surface would be very unlikely to develop space travel.
Brinsley Le Poer Trench