Citadel of Fear

Citadel of Fear is a science fiction novel written by Francis Stevens. 

The sun, he thought, had grown monstrous and swallowed all the sky. No blue was anywhere. Brass above, soft, white-hot iron beneath, and all tinged to redness by the film of blood over sand-tormented eyes. Beyond a radius of thirty yards his vision blurred and ceased, but into that radius something flapped down and came tilting awkwardly across the sand, long wings half-spread, yellow head lowered, bold with an avid and loathsome curiosity.