Listmania!
The best popular history books you can buy.
By an Amazon.com customer
Rubicon: The Last Years of the Roman RepublicRubicon: The Last Years of the Roman Republic by Tom Holland
Buy new: $10.88 / Used from: $6.83
Persian Fire: The First World Empire and the Battle for the WestPersian Fire: The First World Empire and the Battle for the West by Tom Holland
Buy new: $10.85 / Used from: $6.17
Sea of Faith: Islam and Christianity in the Medieval Mediterranean WorldSea of Faith: Islam and Christianity in the Medieval Mediterranean World by Stephen O'Shea
Buy new: $20.48 / Used from: $1.00
The Trojan War: A New HistoryThe Trojan War: A New History by Barry Strauss
Buy new: $19.76 / Used from: $1.15
The Middle Sea: A History of the MediterraneanThe Middle Sea: A History of the Mediterranean by John Julius Norwich
Buy used from: $13.45
Caesar: Life of a ColossusCaesar: Life of a Colossus by Adrian Goldsworthy
Buy new: $24.38 / Used from: $5.99
Very well written and has a very extensive account of the Gallic Wars, exactly what I'd been looking for.
The Fall of the Roman Empire: A New History of Rome and the BarbariansThe Fall of the Roman Empire: A New History of Rome and the Barbarians by Peter Heather
Buy used from: $10.63
Tamerlane: Sword of Islam, Conqueror of the WorldTamerlane: Sword of Islam, Conqueror of the World by Justin Marozzi
Buy used from: $5.01
Samurai: The Story of Japan's Great WarriorsSamurai: The Story of Japan's Great Warriors by Stephen Turnbull
Buy used from: $4.27
Warriors of Medieval Japan (General Military)Warriors of Medieval Japan (General Military) by Stephen Turnbull
Buy new: $12.89 / Used from: $4.16
Highlanders: A History of the Scottish ClansHighlanders: A History of the Scottish Clans by Fitzroy MacLean
Buy used from: $3.24
I try to list only in print books but among Scottish Highlander books this is clearly one of the best , so get it secondhand.
Viking WorldViking World by James Graham-Campbell
Buy new: $21.13 / Used from: $9.00
The VikingsThe Vikings by Magnus Magnusson
Buy used from: $7.74
Vikings : The North Atlantic SagaVikings : The North Atlantic Saga by William W. Fitzhugh
Buy new: $26.56 / Used from: $4.47
Galleons and GalleysGalleons and Galleys by John Francis Guilmartin
Buy used from: $17.19
An Illustrated History of the First World WarAn Illustrated History of the First World War by John Keegan
Buy used from: $4.54
You can also get cheap paperbacks without the illustrations, it's a classic and highly praised book.
Rome and her Enemies: An Empire Created and Destroyed by War (General Military)Rome and her Enemies: An Empire Created and Destroyed by War (General Military)
Buy new: $18.96 / Used from: $4.98
The Enemies of Rome: From Hannibal to Attila the HunThe Enemies of Rome: From Hannibal to Attila the Hun by Philip Matyszak
Buy new: $24.28 / Used from: $1.94
Empires Collide: The French and Indian War 1754-1763 (General Military)Empires Collide: The French and Indian War 1754-1763 (General Military)
Buy new: $16.47 / Used from: $8.56
Lords of Battle: The World of the Celtic Warrior (World of the Warrior)Lords of Battle: The World of the Celtic Warrior (World of the Warrior) by Stephen Allen
Buy used from: $5.99
The Age of Arthur: A History of the British Isles from 350 to 650 (Phoenix)The Age of Arthur: A History of the British Isles from 350 to 650 (Phoenix) by John Morris
Buy used from: $8.98
Mutants: On Genetic Variety and the Human BodyMutants: On Genetic Variety and the Human Body by Armand Marie Leroi
Buy new: $10.88 / Used from: $3.84
Armageddon: The Battle for Germany, 1944-1945Armageddon: The Battle for Germany, 1944-1945 by Max Hastings
Buy new: $12.21 / Used from: $8.49
Auschwitz: A New HistoryAuschwitz: A New History by Laurence Rees
Buy new: $12.48 / Used from: $3.99
Stalingrad: The Fateful Siege: 1942-1943Stalingrad: The Fateful Siege: 1942-1943 by Antony Beevor
Buy new: $12.24 / Used from: $3.33
Gulag: A HistoryGulag: A History by Anne Applebaum
Buy new: $12.24 / Used from: $4.74
Nicholas and AlexandraNicholas and Alexandra by Robert K. Massie
Buy new: $12.89 / Used from: $2.50
Bury My Heart at Wounded Knee: An Indian History of the American WestBury My Heart at Wounded Knee: An Indian History of the American West by Dee Brown
Buy new: $10.88 / Used from: $1.99
Once They Moved Like The Wind : Cochise, Geronimo, And The Apache WarsOnce They Moved Like The Wind : Cochise, Geronimo, And The Apache Wars by David Roberts
Buy new: $22.45 / Used from: $9.42
Montcalm and Wolfe: The French and Indian WarMontcalm and Wolfe: The French and Indian War by Francis Parkman
Buy new: $19.46 / Used from: $0.19
Crucible of War: The Seven Years' War and the Fate of Empire in British North America, 1754-1766Crucible of War: The Seven Years' War and the Fate of Empire in British North America, 1754-1766 by Fred Anderson
Buy new: $14.96 / Used from: $7.50
The World of the GladiatorThe World of the Gladiator by Susanna Shadrake
Buy new: $24.26 / Used from: $7.82
The CrusadesThe Crusades by Yli Remo Vallejo
Buy new: $30.00 / Used from: $25.88
If you are looking for a short and heavily colour- illustrated introduction to the Crusades.
Lewis & Clark: Voyage of DiscoveryLewis & Clark: Voyage of Discovery
Buy used from: $4.63
The CossacksThe Cossacks by Jean Ure
Buy new: $45.00 / Used from: $9.00
Nero's Killing Machine: The True Story of Rome's Remarkable 14th Legion (Roman Legions)Nero's Killing Machine: The True Story of Rome's Remarkable 14th Legion (Roman Legions) by Stephen Dando-Collins
Buy new: $10.85 / Used from: $3.20
Dogs of God: Columbus, the Inquisition, and the Defeat of the MoorsDogs of God: Columbus, the Inquisition, and the Defeat of the Moors by James Reston Jr.
Buy new: $10.88 / Used from: $3.96
The Last Apocalypse: Europe at the Year 1000 A.D.The Last Apocalypse: Europe at the Year 1000 A.D. by James Reston Jr.
Buy new: $14.35 / Used from: $0.01
The Devil in the White City:  Murder, Magic, and Madness at the Fair that Changed AmericaThe Devil in the White City: Murder, Magic, and Madness at the Fair that Changed America by Erik Larson
Buy new: $10.20 / Used from: $1.83
The Story of Britain: From the Romans to the Present: A Narrative HistoryThe Story of Britain: From the Romans to the Present: A Narrative History by Rebecca Fraser
Buy new: $12.89 / Used from: $9.41