You might already know that the 2009 movie Avatar is the biggest money-making movie in history, with a global box office of over $2 billion. However, if you ignore the value of a dollar, the movie making the most money will always be relatively recent. Once you adjust for inflation, there are some classics that still haven't been beat. Check out a list of the top 15 movies ever, based on inflation-adjusted U.S.-only earnings. I've seen them all, and would recommend that you see them all, too, eventually.