Java Edition:Blocks Past the World Border
In newer version of Minecraft, you can't place blocks farther than 30 million blocks away. While it is possible to force cobblestone to generate by placing water and lava near the border it is not possible for any other block.
Obtaining
Infdev 20100327
If you try to go past 32M block you get stuck in a glitched position forever until updating.
Beta 1.8
Blocks past 30M no longer have collision, you cannot place or break blocks and walking past 30M will cause you to fall through the world.
13w36a
Your game will crash if you go past 29,999,840 blocks in 13w36a to 13w36b and you will be stuck in a crash loop until updating.
13w37a
The wall is changed from 2^31 blocks away to 30M blocks.
14w18a
Players can no longer interact with blocks outside the world border. The border was moved from 30M to 29,999,984 so any blocks placed in that strip before 14w18a will be behind the border, and therefore discontinued.