This two-story Hot Wheels track is not only our childhood dreams come true but maybe our adult ones too. Measuring in at 141 feet long, the track starts at a bedroom window and travels down a wooden bridge. From there, the car twists and loops at an average speed of 3.8 miles per hour throughout the entire backyard. Because it is so elaborate, just one view wouldn't do. The run was filmed at three angles, including an ultra-slick first-person view.