The symbolism in 'Heart of Darkness' is what makes it a great fiction book. For example, the Congo River can be seen as a symbol of the journey into the unknown, both literally and metaphorically for the characters. It also critically examines the concept of civilization versus savagery, making the reader question what these terms really mean. Moreover, the complex character of Kurtz is a big draw. His descent into madness and the power he holds over others are fascinating aspects.
One of the main things that makes 'Heart of Darkness' significant is its exploration of the human psyche. It delves deep into the darkness that can lurk within a person. The setting in the African Congo during the colonial era also adds to its importance as it shows the impact of colonialism on both the colonizers and the colonized. The way Conrad writes, with his vivid descriptions, makes the reader really feel the sense of mystery and foreboding throughout the story.