World Downloads
World downloads are copies of a base, build or other 2b2t location which have been downloaded and converted to single player world files via the use of hacked clients or the World Download Mod, which, similar to Optifine, works on Multiplayer servers. World downloads have a wide variety of uses and are a popular trading commodity among the 2b2t community.
Uses
As world downloads allow a base to be preserved, they enable a base to be explored even after its destruction on the main server. This is the core idea of Project Vault, which contains many world downloads of famous bases in their prime throughout 2b2t's history. With the coming of the Rusher War, the demand for Project Vault and world downloads increased. Players today are constantly looking and advertising world downloads, either for personal viewing, or for other projects similar to Vault. Since Vault has been taking too long to go public and the desire to see 2b's greatest builds has grown tremendously due to the influx of players from the Rusher War, it was beaten by the Museum in terms of going public. Many players release world downloads of their bases on the 2b2t subreddit, usually after importing it into worldedit to remove the coordinates as well as nullifying any coordinate exploits.
List of world downloads
While links to world downloads can be found on their respectice articles, I decided to archive them all here as well (please expand if you find more)
From Lifeisgood73's dump (none or little to none of those were built or saved as downloads by him, but the list is copypasted from his subreddit post):
