All Scenarios
Browse all alternate history scenarios across different time periods and regions.
What If Eratosthenes' Calculation of Earth's Circumference Led to Earlier Global Exploration?
Exploring how world history might have unfolded if ancient civilizations had used Eratosthenes' accurate measurement of Earth's size to launch transoceanic voyages, potentially creating a globalized world millennia earlier.
What If Early Modern Civilizations Harnessed Steam Power More Effectively?
Exploring how world history would have unfolded if various civilizations had developed practical steam power technologies in the early modern period, centuries before the Industrial Revolution.
What If the Crusades Never Happened?
Exploring how European, Middle Eastern, and world history would have unfolded if Western European powers never launched military expeditions to the Holy Land.
What If the Battle of Teutoburg Forest Never Happened?
Exploring how world history would have unfolded if Rome had avoided its devastating defeat in Germania and continued expansion eastward beyond the Rhine.
What If Greek Atomism Became the Dominant Scientific Theory?
Exploring how science and philosophy might have developed if Democritus and Leucippus's atomic theory had become widely accepted in the ancient world, potentially accelerating scientific understanding by millennia.
What If the Byzantine Empire Reconquered the Western Mediterranean?
Exploring how European history would have unfolded if Justinian's reconquest had succeeded more completely and endured, reuniting much of the old Roman Empire.