I have to thank my daughter for introducing me to the concept of "retro travel posters" more than a year ago. Just go to ETSY.com and do a search and you will find hundreds of options. Including many for destinations from places mentioned in the Harry Potter books, or Lord of the Rings, or Game of Thrones and more.
Now NASA is getting into the game as well. Of course, their website has much more informaion and educational opportunites once you have selected a destination.
You can check out all the designs and download them for free at NASA's website.
They also have a fun "travel planning" page as well with more information a some "featured" destinations. Take a peek here.