Olympus Mons, on Mars. The base of this volcano covers a land area roughly equal to the size of the American state of Missouri. The height is almost two and a half times the height of Mt. Everest.
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@Phantome Interesting. Mars has no magnetic field, because unlike Earth it has no hot molten core. The planet is small enough that the core solidified long ago. So it would be surprising to me if there was still hot lava below the surface.
But, I do not claim to be a professional planetary scientist. I am not. There may very well be something I've missed in my haphazard reading about Mars.
