- "The City of God" (2007)
- "The Walls of Hadrian" (2010)
- "The War of the Flowers" (2012)
- "The Seven Wonders of the East" (2013)
- "Children of Time" (2014)
- "The Kingdom of Ashes" (2015)
Non-Fiction:
- "The Medieval City in Europe" (2003)
- "The Crusades" (2006)
- "The Mongols" (2008)
- "The Black Death" (2012)
- "The Holocaust" (2016)