This page shows ways you can embed photo spheres on any website with an interactive, 360-degree panorama viewer just like you see in Street View on Google Maps.
Street View in the Maps Embed API
The Google Maps Embed API lets you display Street View images on your site or blog as interactive photo spheres. Google Street View provides panoramic views from designated locations throughout its coverage area. User contributed photo spheres, and Street View special collections are also available.
Here is an example of an embedded interactive photo sphere:
The service provides panoramic 360 degree views from designated roads throughout its coverage area. Street View's API coverage is the same as that for the Google Maps application. The list of currently supported cities for Street View is available at the Google Maps website.
Street View Image API
Here is an example of a static image URL for a photo sphere: