The best books on the 1918 Spanish flu include The Great Influenza, Pale Rider, Flu by Gina Kolata, America’s Forgotten Pandemic, The Pull of the Stars and The Last Town on Earth.

The best books on the American Mafia include Five Families, Wiseguy, Donnie Brasco, Honor Thy Father, The Valachi Papers and The Godfather.

The best books on the Industrial Revolution include The Most Powerful Idea in the World, The Lunar Men, Empire of Cotton, The Making of the English Working Class, Hard Times and North and South.

The best books on Queen Victoria include Victoria: The Queen by Julia Baird, Queen Victoria by Lucy Worsley, Victoria: A Life by A. N. Wilson, Victoria and Abdul, Becoming Queen Victoria and Victoria by Daisy Goodwin.

The best books on Queen Elizabeth I include Elizabeth the Queen by Alison Weir, Elizabeth I by Anne Somerset, Elizabeth: The Struggle for the Throne, The Armada, Elizabeth’s Spymaster and The Virgin’s Lover.

The best books on Genghis Khan include Genghis Khan and the Making of the Modern World, Genghis Khan: His Life and Legacy, Genghis Khan by Frank McLynn, The Secret History of the Mongols and The Blue Wolf.

The best books on Napoleon include Napoleon: A Life by Andrew Roberts, The Campaigns of Napoleon, 1812, Waterloo by Bernard Cornwell, Napoleon: A Concise Biography and War and Peace.

The best books on Cleopatra include Cleopatra: A Life by Stacy Schiff, Cleopatra: Last Queen of Egypt, Antony and Cleopatra by Adrian Goldsworthy, The Memoirs of Cleopatra and Shakespeare’s Antony and Cleopatra.

The best books on Alexander the Great include Alexander the Great by Robin Lane Fox, Alexander of Macedon, The Landmark Arrian, Ghost on the Throne, Fire from Heaven and The Persian Boy.

The best books on the Silk Road include The Silk Roads by Peter Frankopan, The Silk Road: A New History, Life Along the Silk Road, Empires of the Silk Road, Shadow of the Silk Road and Samarkand.