There are two worlds included in the world download. The pre-multiplayer world is how the server looked like on day one and the April 2011 version is what the server looked like before corruption. Play both of these on Beta 1.8.1!

This is what my singleplayer world looked like before the original multiplayer launch in 2011. The city became the original Capital. More recent versions of the original Capital don’t exist as I did not do backups yet. Eventually the world was corrupted and what I call as the Legacy Server was created, which included Survivia, the new Capital, and uncorrupted chunks from the original server.

However, I was able to recover the original server world at the instant that it was corrupted by a trapped house filled with TNT. I believe that the amount of entities in one chunk were able to overwhelm the weak ass Beta server, but since then I was able to remove all those entities.