The Alhambra is Spain’s most significant and well-known Islamic architecture. M.C. Escher visited on at least two occasions and his sketches of Alhambra, along with those of his wife, informed his artwork style.¬† According to the text Visions of Symmetry¬†he sketched a portion of a wall in Alhambra on 0ctober 20 1922 and again between May and June 1936 he and his wife made numerous sketches.

Schattschneider, Doris. Visions of Symmetry: Notebooks, Periodic Drawings, and Related Work of M.C. Escher. W.H. Freeman and Company. New York, 1990.