In December 2013 Google announced a new feature, the ability to build your own Street View. This new feature allows you to connect your panoramas to create 360º virtual tours of the places that would not normally be represented by Street View and submit them for the world to view on Google Maps.
This feature is called "Constellations", after the way the map looks during construction like a "constellation" of stars. The Constellation below is embedded from Google Map Views.
Connected panoramas can also be connected into conventional Street Views allowing the viewer to pass from the Constellation back into Street View. It provides a new tool for photographers to showcase diversity in a specific location -- by times of day, weather conditions or cultural events -- in a way that Street View currently doesn’t cover and allows locations to become much more accessible through Google Maps.
How do they work?
Constellations are created from a several 360˚ panoramas that lie within a certain range of each other, anywhere from a few metres to half a kilometre. The Constellations are accessed by a URL or by searching for a location on either Google Map Views or the standard Google Maps.