I don't think you can teleport to different worlds like that, but what you could do is have the command block warp to, say, a Nether portal that will come out exactly where you want the player to be teleported to.

install warptastic plugin
set warps at the destination worlds
program your 137 block to /warp instead of /tp

job done.

As said before, there is no way to teleport from places like the overworld to the nether. However, if you want to be fancy, you could have command blocks in the overworld teleport a player right into an end portal; and when they spawn in the End they trigger pressure plates teleporting them somewhere in the end.

Way over complicated then it needs to be.

If you need any help building or doing the red stone to actually do that I can help you I actually just had an idea

Or if you are planning to make a map, you can use:

/tp (@p/@a) (x-axis) (y-axis) (z-axis)
__________________

@p is the nearest player
@a is all the players in the using world

No parenthessess btw

Thanks Twiggsta! your post is extremely helpful

As far as I know it isn't posible without mods as the command block command line is read as follows /tp [player name] 56 64 37 So unless this is changed some time in the future (1.6) this will still be impossible.

Hope this helps you on you magical adventure to build an adventure map or something of that description, if you would like to get more info type /tp in game to see what you can and can't do with the teleport command or go to the wiki page for it.

How would I use Mcedit to set that up?

Thanks for all the great replies

Not that i know of without having to use MCedit...

Im not so sure, But I know you can teleport around the world

I think its /tp [world] [cords]

But again i am not too sure