I am a big fan of the whole 360° video sensation sweeping across education at the moment. I like the Google Cardboard/VR Headset idea, but we don't have very many of these in our district. What we do have are big SMARTBoards, 70 Inch Monitors, iPads, and Chromebooks. So we can still utilize the videos, but just not as immersively as the Cardboard experience.
YouTube has lots of 360° videos posted. However, just a search for 360° video can bring up some inappropriate videos as well. So don't just turn students loose. The teacher should be the one to search.
I really like the National Geographic videos. Here is a link to their playlist
Don't forget about the Google Arts and Culture website. Many Street View and some 360° views can be found in it as well.
Some people are afraid to use YouTube with students do to the recommended videos and comments section. So here are a few tips to get around that.
1. Use a tool like https://safeshare.tv/. Enter your YouTube video URL into the box and Generate a Safe View
2. Use the Insert Video option in Google Slides. Then in Present mode, the 360 Video will still work.
A Few of my favorite 360° examples