Vehicles have long been a part of human civilization and have served as indispensable tools for moving people and goods across large distances. The first vehicles appeared 4,000 years ago and have since become more useful and efficient. As we travel back in time, we come across amazing vehicles that have created the framework for modern transportation. From humble beginnings to innovative inventions, here are 15 of history's earliest vehicles that have left an indelible mark on human history.