Get it into orbit and use it to tether (and as material for) a space elevator.
Now, space elevators are another topic. We don't have the materials right now but fun stuff like if one collapsed, it would wrap around the world a couple of times (IIRC).
the circumference of earth is 24k miles. a space elevator woiuld need to be up probably 22k-26k miles. i guess it depends if this wrap would follow a circumference line or a smaller one. nice problem to think about. thx.