Lighttech pretty much said everything.
No lands are closed during the fireworks. The WDW Railroad is closed for each show. When the 360 degree perimeter shows are shown on NYE and 4th of July, entrance and exit into or out of the park is closed for roughly 45 minutes.
In lighttech's last picture, the 4 rows of bunkers closest to the road are a fairly new addition. MK now has the capacity to launch 3 shows of Wishes in one night if I am not mistaken. This is used when both Wishes and a speial event show is shot. The bunker site is located directly behind the castle just about 0.3 mile north.
In the pictures of the 10 bunkers in Fantasyland, after each show, the tops of those buildings are doused with water for about 15 minutes. This is done to prevent anything from catching fire. These bunkers do launch explosive shells.
Another thing worth mentioning is that a 3rd MK main launce site is located on an island in Seven Seas Lagoon. This is used during the NYE and 4th of July shows along with their respective rehearsals. This is then called a "mirror" show inwhich both the site behind Fantasyland and the island site shoot the same exact show at the same time.
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