[Candor7]

During the day, one of the features - nicknamed "Annie" - is warmer than surrounding pits and cooler than sunlit areas.>>>>>>>>>>>>>>>>>

I can see your house from here.

Smoke from the chimney? LOL.

[RightWhale]

Thanks for the image. The caves are ice-formed tubes that have broken through to the surface and the ice evaporated. There are many examples on Mars, some with some ice still in them.