U.S. Route 66 was a highway in the United States. It was built in 1926, and it ran all the way from Chicago, Illinois, to Los Angeles, California. It was like a big road that connected many cities and towns, so people could drive all the way from one side of the country to the other. People liked to drive on Route 66 because it was a fun and exciting way to go from one place to another. It was like a big adventure! People still talk about Route 66 and remember it today as one of the most famous and exciting highways in the United States.