Google is to make its popular Street View service available as a virtual reality app viewable on its budget headset Cardboard.
It has also released figures which suggest Cardboard could be a serious competitor to more expensive headsets.
Google Cardboard is now available in more than 100 countries and Cardboard-ready apps have been installed 15 million times, it said.
One analyst said Street View was a "natural fit" for virtual reality.
Google also announced that it has a growing number of certified viewers - including the Mattel View-Master and the Zeiss VR One GX - on sale, which are made of plastic and are more robust than the original cardboard viewer.