This is an elevator that is powered by pistons and can travel from the top to the bottom limits of any minecraft map!
it basically is two columns of alternating blocks and redstone torches to supply alternating currents to the pistons, which is attached to a redstone clock which provides the synchronization for the alternating redstone currents.

Additional Notes

To go up:
Regular piston on the bottom
Sticky piston on top

To go down:
Sticky piston on top
Regular piston on bottom

elevator is very simple and can be improved on.