A few years ago I had a run of buying National Geographic. They had some really good posters in a couple of them. I have two on my wall, set up above and behind my computer screen -
One is a graphical reconstruction of the Acropolis of Athens from the Hellenistic period (though without painted columns

).
The other is what purports to be a map of the universe, so far as can be done. It has a few different sections - first a view of our solar syatem>>then showing where our star lays in proximity to the nearer stars in our galaxy>>then it shows where that fits in with the Milky Way>>then it shows how the Milky Way relates to the Local Group of galaxies>>then it shows how that relates to the galactic supercluster that we are a part of. A lovely picture.