If you want to see a world map for Call of Duty: Black Ops 4 that provides a location of every mystery box or helicopter spawn and shows the layout of the buildings or underground area, make sure to check out this article.
Call of Duty: Black Ops 4 has a Battle Royale mode world map called Blackout. It is currently available to play in beta phase on the PS4, Xbox One, and PC. If you want to see how the world map is designed before playing it to discover all things yourself, there is now a detailed map available to view as seen below.
While this world map is entirely fan-made and it might not be entirely 100% accurate, and could potentially miss out on other key locations, it is still good for a reference if you want to go into the Blackout mode full prepared. The fun of Battle Royale is in getting to know how the world map pans out and then making sure you are prepared for it.
Call of Duty: Black Ops 4 will be available on October 12th for the PS4, Xbox One, and PC. The game is being developed by Treyarch Studio and will be published by Activision. Recently, GameInformer managed to get some more details about the game including the player count for the Blackout mode while some details about the story missions were also leaked earlier.