Mammoth trees near Martian south pole? Well, they’re curious, whatever they are. Could be accretions of something sticky, as in the ‘Coral’ screensaver.
Reminds me of a book I have, Where will we go when the Sun dies?, which I keep only because it contains a list of objects on the Moon which ought to have a closer look because they could be artifacts, e.g. what appears to be a bridge over a canyon.
Later: Never mind that the site owner is a true believer in the Cydonia Face . . . .