The post immediately preceding this one featured the new "solo" mode for Google Expeditions. Expeditions is the mobile app that allows users to experience virtual reality tours when they place their phones into virtual reality viewers like the Google Cardboard viewers. If you can't buy VR viewers for your classroom or you just like DIY projects, it is possible to make your own VR viewer with just a few common materials. YouTube "celebrity" Roman UrsuHack offers the following video that provides an overview of making your own VR viewer.
The template that Roman UrsuHack follows in the video can be found here (link opens a PDF).
By the way, folks coming to the Practical Ed Tech BYOD Camp next week will get a chance to create their own VR viewers. There is still time to register to join us.