The book offers an elucidation of two of the most important themes in Martin Heidegger's early as well as later philosophical writings. These perennial themes of his thought, namely, the concept of the world and his existential analysis of death, are explored as the ongoing philosophical problems grappled by this important thinker of the twentieth century within all periods of the body of his entire work. These themes are closely related to the fundamental issue of Heidegger's thought namely the question concerning the meaning of Being for which a proper elucidation of the world-concept and death is absolutely crucial. Since this book considers all the important phases of Heidegger's thought along with all the important ongoing conceptual preoccupations of this thinker along with his original analyses of human existence and the world, the notion of the ground, art and artworks, language, dwelling, and death, it can serve as a substantive introduction to the philosophy of Martin Heidegger.