I got stuck in tower area recently, and not sure if this works on all versions, but press ` (the key usually near top left of keyboard), should open a black bar at the bottom.
Type the word "OPEN" and press space, there should be some options for maps to teleport to, I can't remember the exact name for the overworld, but try a few, should eventually get one that gives the normal loading screen and a wanted spot you can move around with.