I also find locating images an interesting skill to develop. I originally only wanted to mention https://old.reddit.com/r/picturegame,* which I find more "organic" than Geoguessr: players submit single images, which are identified using whatever means are available. It has a quirk in that often people submit images found online, which must be obfuscated to prevent trivial reverse image searching. A randomly transformed translucent mask is recommended, but those are still relatively easily reversed! I haven't tried, though--maybe there's greater difficult than at first apparent.
* It turns out, after an HN search, that this is a more common organized activity than I'd thought; this thread lists several other communities:
I've been doing something like this privately for my own picture library – because my backlog of pictures-to-be-geotagged is about 15 years, I don't necessarily remember all the details where exactly a picture was taken. Of course I could just drop the location marker in roughly the right location and call it a day, but pinpointing the location as accurately as possible is usually too tempting.
* It turns out, after an HN search, that this is a more common organized activity than I'd thought; this thread lists several other communities:
https://news.ycombinator.com/item?id=17692172