‘See Inside’ is a special feature of Street View. It allows you to go indoors as well! Using Google Maps Business View, you can experience 360-degree virtual tours of businesses, restaurants, shops, and hotels in more than 30 countries globally.
When using Street View, you choose photo spheres for either the “See inside” or “See outside” thumbnails. The Street View editor will automatically choose the “See inside” thumbnail if only 1 photosphere is available.