What are some of the most thought-provoking and artistically executed graphic novels?

"Maus" by Art Spiegelman , "The Passion of a Man" by Frans Masereel , "Wild Pilgrimage" by Lynd Ward, "White Collar" by Giacomo Patri , "Southern Cross" by Laurence Hyde , "Destiny" by Otto Nuckel , "Une Semaine De Bonte : A Surrealistic Novel in Collage" by Max Ernst and "Give it Up" and "The Metamorphosis" (GNs based upon the writings of Franz Kafka) by Peter Kuper .