In my D&D Campaign my players got themselves a stronghold, and I used maps from Stronghold Builders' Guidebook (official Wizards of the Coast product).

Now, the maps presented there were simple 'overhead' blueprints, while the descriptions themselves included a lot of detail that wasn't shown on the maps (like furniture, weapons, armor, tools, trophies, maps, tables, busts, instruments,...).

I decided to remedy that and drew the isometric version of the maps - and here is the first part (others are still WIP):

citadel-01-shadow.jpg