The Armory is situated up a flight of stairs accessed from The Library. It is divided into the main room, three circular rooms adjacent to the main room, and a Lower Gallery down a flight of stairs in the middle of the Armory.
There is also a Museum Storeroom where you can configure some of the museum displays.
This is where you can display non-special armors and weapons that you come across in your travels or craft yourself. The main room holds displays for common armor and weapon pieces, and displays for items from Immersive Weapons, Immersive Armors, Heavy Armory, and Dawnguard Arsenal. The armor can be displayed by clicking on the display plaque or by placing it in the 'Armory Storage' cabinet next to the entrance. Weapons can only be displayed by placing them in the cabinet.
The lower level of the armory is reached by going down a stairway in the middle of the Armory. It has many undedicated displays for both armor and weapons that you can use as you see fit.
There are three circular display rooms that you can fill with what you want. They function as a sort of personal armory. Any weapons or armor placed in these rooms will not count towards the total display count.