Download a world from server minecraft
If you do have direct access to the server itself, of course, you could just shut down the server for a few seconds (make sure no one is logged in!) and copy the map data directly from the server into your own MC world folder, and start the server back up. In order to play the world you must first click the download button next to the description. Then what you want to do is open this folder. Next you want to search %appdata% look online to see where to search this. Finally open the .minecraft folder, open saves, and drop the folder in. Now run minecraft and go to singleplayer and open the world.