Long ago, I worked in a large camera shop that sold View Master viewers. We also had a huge selection of discs of various subjects such as national parks, animals, plants, travel destinations (like the Eiffel Tower, Statue of Liberty, etc.) about anything anywhere in the world you might like to see. We also sold the 3-D cameras so you could make your own stereo slides. I think the discs were about 50 cents each. Which wasn't exactly cheap at the time.
I imagine you can still find about all of the viewers and discs you would ever want on eBay. I knew there were View Master projectors but I don't remember seeing one. Seems like thei View Master products maker was a company called Sawyers.