During the restoration process, this hand-painted map was found underneath several layers of wall paint. There's no record of it, but using the names of several countries, it's assumed it was painted during World War II and possibly used to brief officers.
During the war, the Iowa transported President Roosevelt across the Atlantic to meet with Churchill, Stalin and other Allied leaders. During that time he used the captain's in-port cabin including this, the wardroom (the captain used his at-sea cabins).
What most fictional ships hide is all the wires and tubes that let a vessel function. Since you never know what might go wrong and when, having access is key. Note the curve of the armored conning tower on the right.
This is where the helmsman steered the Iowa. If the ship came under fire, the command staff would squeeze in here. The helmsman couldn't see out very well. Instead he just followed the orders of those who could.
This is the other side of the wall from the last photo. Because there were nearly 1,000 fewer men on board in the '80s, there was a little bit more free space. This area held 62 in WWII and Korea, and 42 in the '80s.
Though it's a fast tour, it's a good one, especially when aided by the official app for Android and iOS. There are even special guided tours occasionally that give access to parts of the ship currently inaccessible during a normal visit. For more info, check out its website.