The Smoky God: A Voyage to the Inner World by Willis George Emerson This is a classic fictional hollow earth adventure. The narrator, Olaf Jansen, is a Norwegian who sails with his father deep into the northern ice. There they sail over the lip of the hollow earth, and into the inner world, lit by a dim central sun. The inhabitants are an advanced race of giants who have electricity, monorails, and extremely long lifespans. The travelers return to...