If Rome had never fallen, the world would likely be vastly different from what we know today. The Roman Empires influence would have continued to shape global history, potentially leading to a world where Roman culture, language, and technology dominated. The Western hemisphere might have been easily conquered by Rome after the discovery of the New World, leading to an empire that would have had a significant impact on global civilization. There are various speculative scenarios, such as Rome industrializing centuries before it did in our timeline, potentially leading to space exploration and colonization of other planets. Additionally, it is believed that if Rome had been able to control its civil wars, it might have become allies with China and eventually used Chinas invention of gunpowder to take over the entire continent of Asia due to its stronger economy. The influence of Roman technology, such as concrete, could have had a more continuous impact on architectural and technological advancements. However, its important to note that these are speculative scenarios and the actual outcome of a world where Rome never fell would be impossible to predict with certainty.