I keep mine as souvenirs of my trips. I add the dates and the itinerary. I don’t look at them much, but it’s nice to have the physical reminder of places I’ve been.

Donate to a thrift store. Lots of crafty types use books for art projects. I’m one - I make collage cards, wreaths, journals, decoupage from otherwise unusable books.

Do they have photos? My kids have used stuff like that for school projects.

Check Amazon Market and see if there is a any value for older editions.

So I have about two travel books that are at least 15 years old. Should I just recycle them? I've been selling to used booksellers and donating to library but it's not like people take everything (if you don't want it why does anyone else?) I've never tried selling travel books but I can't imagine there's much demand for it as these books are out of date and probably worthless.