Large multiplayer minecraft server?

Can someone please give me a straight answer. I have been searching for about 3 months on how to do this and no one is helping me. I just want to know if there's any way AT All to make a large minecraft server such as the one in the picture. Is there some kind of continent generator. I don't have the time to build a whole new terrain. And yes, I have an amazing computer. The computer is not my problem I just need to know how do people get large servers like this.Large multiplayer minecraft server - 1

BlogRot is right, and if you want to be able to see the world map as it is generated after your server is running, then you need Dynmap.