An Irreverent Curiosity: In Search of the Church's Strangest Relic in Italy's Oddest Town,[2] Farley's first book, is a narrative history/travelogue about Farley's time living in Calcata, Italy while searching for the Holy Foreskin, which was preserved in the medieval hill town's church for centuries until it went missing under mysterious circumstances in the 1980s. The book was named one of the best travel books of the year by the Los Angeles Times and WorldHum.com and one of the best books of the decade by the Dubuque Telegraph Herald. In October 2010, it won a Lowell Thomas Award for best travel book.[3]
In December 2013, National Geographic Channel broadcast a documentary, starring Farley and based on his book, called "The Quest for the Holy Foreskin".[4]
Underground Worlds
In May 2018, publisher Black Dog & Leventhal published Farley's second book, Underground Worlds: A Guide to Spectacular Subterranean Places.[5]