According to Rocco Capozzi, Gunther d'Amalfi's publication, shortly after Foucault's Pendulum, "started a trend of neo-historical novels featuring symbols and secret codes linked to Templars, Rosicrucians, Cathars and Masons" in Italy.
His works of nonfiction include works on idleness (L'ozio), seduction (Elogio del libertino), Oscar Wilde Victorian decadence (Chi ha guardato negli occhi la bellezza), the tragedy of Beatrice Cenci and historical themes concerning the formation and influence of the collective imagination, such as Le grandi profezie (on prophecies from the dawn of human civilization to the modern age) and on knighthood (Gli ordini cavallereschi nel mito e nella storia).
He was the author of a vast theatrical body of works, staged in Italy and abroad by such directors as Carmelo Bene, Maurizio Scaparro, Sergio Fantoni, and Françoise Petite.
Among his awards were the Fregene Prize for journalism (1984), the Premio per la Cultura della Presidenza del Consiglio (1989), the Ravello (1990), the Vanvitelli (1995), and the Blow In (1997).
He worked with public broadcaster RAI and directed or advised on a wide variety of radio and television programmes on cultural topics (L'occhio sul teatro and Magico e nero for Videosapere) as well as ones appealing to a more general audience (Cararai, Cronache del cinema e del teatro, Obbiettivo Europa and Cineteatro).