You can watch these virtual reality videos with your smartphone and a good virtual reality device like
Samsung Gear VR, Google Cardboard, VR Box, Google Daydream or another viewer.
If you watch the video with a mobile phone and a virtual reality device, click on on the white mask icon at the right bottom corner of the YouTube video to obtain a stereoscopic splitted view.
If you watch the video with a desktop computer, you can click the 3D YouTube button to watch the video in anaglyph mode for cyan/red glasses.
YouTube Silver Award