Heart of Darkness is a novella by Polish-British novelist Joseph Conrad, about a voyage up the Congo River into the Congo Free State, in the heart of Africa, by the story's narrator Marlow. Marlow tells his story to friends aboard a boat anchored on the River Thames, London, England. This setting provides the frame for Marlow's story of his obsession with the ivory trader Kurtz, which enables Conrad to create a parallel between London and Africa as places of darkness. Central to Conrad's work is the idea that there is little difference between so-called civilised people and those described as savages; Heart of Darkness raises questions about imperialism and racism. Originally published as a three-part serial story in Blackwood's Magazine, Heart of Darkness has been variously published and translated into many languages. In 1998, the Modern Library ranked Heart of Darkness as the sixty-seventh of the hundred best novels in English of the twentieth century. Aboard the Nellie, anchored in the River Thames near Gravesend, England, Charles Marlow tells his fellow sailors about the events that led to his appointment as captain of a river steamboat for an ivory trading company. As a child, Marlow had been fascinated by "the blank spaces" on maps, particularly by the biggest, which by the time he had grown up was no longer blank but turned into "a place of darkness" (Conrad 10). Yet there remained a big river, "resembling an immense snake uncoiled, with its head in the sea, its body at rest curving afar over a vast country and its tail lost in the depths of the land" (Conrad 10). The image of this river on the map fascinated Marlow "as a snake would a bird" (Conrad 10). Feeling as though "instead of going to the centre of a continent I were about to set off for the centre of the earth", Marlow takes passage on a French steamer bound for the African coast and then into the interior (Conrad 18). After more than thirty days the ship anchors off the seat of the government near the mouth of the big river. Marlow, still some two hundred miles to go, now takes passage on a little sea-going steamer captained by a Swede. He departs some thirty miles up the river where his Company's station is. Work on the railway is going on, involving removal of rocks with explosives. Marlow enters a narrow ravine to stroll in the shade under the trees, and finds himself in "the gloomy circle of some Inferno": the place is full of diseased Africans who worked on the railroad and now await their deaths, their sickened bodies already as thin as air (Conrad 24-25). Marlow witnesses the scene "horror-struck" (Conrad 26).