Time travel is an irresistible premise for filmmakers. Who hasn't thought about going back in time and changing the past, or going ahead and seeing the future? Scientists are pretty sure time travel, as least as it's depicted in most movies, is absolutely impossible. But how boring would movies be if they always made sure every moment was scientifically possible? If a character tells us that 1.21 gigawatts of power sent into something called the Flux Capacitor sends you back in time, so be it. We asked our readers to vote for their favorite time travel movies. Here are the results.