What’s everyone’s favorite frontend maps API?
Google Maps API
Is Google maps API free to use?
Google Maps Javascript API
You'll probably want to be doing this server-side using something like PHP.
I would personally be extracting the EXIF data, filename, etc. using PHP and then storing those in a database. Then call that info out to an array in your Javascript and iterate through those to create your markers.
I'm not on a computer where I can grab you the exact code, but if you look at https://developers.google.com/maps/documentation/javascript/markers#maps_marker_simple-javascript
Add latitude and longitude arguments to that function, and iterate through them for each of the markers you need to add.
Something like this might help you - https://stackoverflow.com/questions/59866292/google-map-api-custom-markers-based-on-data-marker-value
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» npm install @googlemaps/js-api-loader