The Cloudland

This is the land above the clouds. Mysterious. The Cloudland is a mysterious area located above the clouds in the "Old" Worlds. You cannot build on it, and as long as you are above the map, you will not fall through. You have to be out of the map to enter this area. As more and more people heard about The Cloudland, they began calling it another dimension. This is not possible as that type of coding has not yet been implanted into the game's code. If you want to go to this area you must exit the map. This tutorial can come in handy while attempting: http://www.youtube.com/watch?v=hFbHE9S-Gng

Accessing
Accessing The Cloudlands is simple, simply walk next to the edge of the map, and build straight up until you have reached max height (when you can no longer place blocks). Then you can walk off the map.

Cause
The Cloudlands are most likely cause by the game's Invisible Bedrock Barrier in "Old" Worlds. For some reason, you can go through the invisible bedrock that sets the max height, but still stand on it. Possibly because the invisible bedrock makes an upside-down L shape, in which you stand on the height-restricted invisible bedrock.

Trivia

 * If you change to 3rd person view, you will appear invisible.
 * You can get lost in this area, although walking in a straight line can bring you back to earth.
 * The Cloudland is similar to The Farlands, a removed glitch in the PC edition.
 * Exiting Minecraft PE and then coming back in will teleport your character to the map again.
 * Using a Compass can really help if you are lost in the Cloudlands. The Compass will point in the direction of your spawn point, leading you to your world!
 * When you are above the clounds on multi player, nobody will see you.