Hi @jdemas, it’s a little outdated (and the map seems incomplete/zoom level seems wrong on my screen), but the only thing built into the iNat website that does something like this is adding on /stats_slideshow to the end of your project URL:
https://www.inaturalist.org/projects/rrf-biodiversity-catalog/stats_slideshow
https://www.inaturalist.org/projects/river-revitalization-foundation-bombus-survey/stats_slideshow
There is a relevant feature request you may want to vote for: https://forum.inaturalist.org/t/presentation-mode-as-a-full-screen-slideshow-of-observation-images/8316