Critic William Fulwiler argues that Edgar Rice Burroughs' "At the Earth's Core" was one of Lovecraft's primary inspirations for "The Nameless City", citing "the reptile race, the tunnel to the interior of the earth, and the 'hidden world of eternal day'" as elements common to both tales. More generally, Fulwiler suggests, the theme of "alien races more powerful and more intelligent than man", which recurs frequently in Lovecraft's writings, may derive from Burroughs' Pellucidar stories. However, both writers drew on an already existing and vast literature of "lost city" stories and novels.