This is truly one of those tools that you have to "see to believe." Meaning, if you want to fully understand this tool, you should seek out a workshop or try to get a sample and try it out for yourself. Google Expeditions are a great way to immerse students in learning.
From Google Support
Google Expeditions enable teachers to bring students on virtual trips to places like museums, underwater, and outer space. Expeditions are collections of linked virtual reality (VR) content and supporting materials that can be used alongside existing curriculum. These trips are collections of virtual reality panoramas — 360° panoramas and 3D images — annotated with details, points of interest, and questions that make them easy to integrate into curriculum already used in schools. Google is working with a number of partners, including: WNET, PBS, Houghton Mifflin Harcourt, the American Museum of Natural History, the Planetary Society, David Attenborough with production company Alchemy VR and many of the Google Cultural Institute museum partners to create custom educational content that spans the universe.
Over 600 Google Expeditions in a Spreadsheethttps://docs.google.com/spreadsheets/d/1uwWvAzAiQDueKXkxvqF6rS84oae2AU7eD8bhxzJ9SdY/htmlview#gid=0
For more information on Google Expeditions