How to transfer buildings and objects from one Minecraft world to another? [duplicate]

Worlds are not tied to accounts, but computers. On their computer, you will need to go to:

• In case you are using Windows: %appdata%/.minecraft/saves and copy your world to a flash drive, and put it in the same directory in your computer.
• In Linux the same folder can be found at: /home/< your Linux username >/saves

On your friend's computer find your minecraft folder(On Windows type %appdata% then go to .minecraft, then to saves. On Mac open finder, then select the drop down menu Go, then click Library, then to Application Support, then to Minecraft,then to saves) Copy your world then have your friend email it to you or put it on a thumbdrive Edit: You will need to do the same thing you did to find the save and put it in your saves folder on your own computer

The easiest way I can think of would be to use a program like MCEdit. Although im not sure if it will let you just copy and paste from one world to another. You might have to still recreate it, but using MCEdit will make the process a lot faster. Here's another link on how to use MCEdit.