Italian Baroque and Rococo Architecture, Oxford University Press, New York and Oxford, 1986; translated as Arquitectura italiana del Barocco al Rococó, Alianza Editorial, Madrid, 1990.
Rome, A Literary Companion, John Murray Ltd, London, 1991; revised editions: St. Martin’s Press, New York, 1995; Penguin Books, London, 2001; Chameleon Books, Chesterfield, MA, 2007.
Caravaggio: The Art of Realism, The Pennsylvania State University Press, University Park, 2006, 2010.
Tastes and Temptations: Food and Art in Renaissance Italy, University of California Press, Berkeley, 2009.
Wine: A Cultural History, Reaktion Books, London/University of Chicago Press, Chicago, 2010; translated as Vino: tra storia e cultura, Odoya srl, Bologna, 2011.
Edward Lear in Malta, Fondazzjoni Patrimonju Malti, Valletta, 2014; distributed by Book Distributors Limited (www.bdlbooks.com).