The world's biggest garage door is actually in the international space station orbiting around Earth. It's the "cargo bay doors" (similar to a garage door) that allows for building and projects in space. For example, building a spaceship sometime in the future that can travel faster than light speed. (Faster Than Light= FTL)
Ic ould be fueled by element 115, which is created in supernovas of stars, found on some planets.
In 115 energy fiel of the strong force is greater than the atomic nucleus. You can use this property to phase shift the strong force, and manipulate it as gravity. (the strong force is 10^34 time stronger than gravity) Amplify the gravity waves, and the nyou have an incredibly powerful source of artificial gravity. You can bend space and time: collapse space and release it. “Pinch”
You can move 7 lightyears in an instant. But distance trades off with preciseness. (1 lightyear= 93 million miles). You can also use this tech as antigravity or gravity applications in space stations, etc.
Another hypothesized way of traveling faster than light would be to use particles that travel faster than light at all times (tachyons).
If FTL isnt' possible, there's always subluminal travel. Though long distance subluminal travel will result in relativistic time dilation. For example, if a proposed spaceship will accelerate at 1G constantly, after ten years, its passengers will reach speeds close to the speed of light, and time dilation will go into action and increase their lifespans to what seems liek thousands of years to planetside observers. To the passengers, it will seem like the distance is contracting and time remains the same, but to outside observers, it will seem like time is slowed for those on board. When the passengers finally reach their destination, hundreds or even thousands of years will have already passed.