Dear (Miss Snark) -edited for anonymity
I'm the family pack-rat. I have four albums full of photos taken on an around the world trip back in 1925. They're gorgeous. I think there's the makings of a sort of "lost world" picture book/coffee table book.
There are many more photos than I would ever use in a book. They are very high quality, and have never seen the light of day outside the family. The text would have to focus on the lost-world quality of the photos.
Is there a market for this sort of thing? Anywhere? I'm not sure how to research the market at all. Any suggestions?
Sadly, there is probably no trade market for this kind of work. The other problem is you'd have to be real clear on who owns the copyright. Work done in the 20's can be in the public domain now, but I can't remember offhand if it's after 1923 or 24 or later.
There may be scholarly interest in these rather than trade book interest. You'd do well to talk to your librarian about archives for this kind of material. Another interested party might be film costumers and set decorators. Again, your librarian is your Most Awesome Resource on this.
Don't throw them away even if they aren't "salable". That opinion is not carved in stone and situations do change.