Where can you walk on the mantle?

I'm intrigued by the idea of walking on the mantle, but I'm not quite sure I understand the context. Are you referring to a geological mantle, such as the Earth's mantle, or perhaps some other kind of mantle? As far as I know, the Earth's Mantle is a layer of hot, dense rock located between the crust and the outer core, and it's not a place where one can physically walk. So, could you please clarify what you mean by "walking on the mantle"? Are you referring to some other type of mantle, or is there a metaphorical meaning to your question that I'm missing?