Google have started accepting floor plans of buildings. If there are plans known, this could help drop pins on spaces within buildings that are not 'street viewable'.
"Serendip-o-matic connects your sources to digital materials located in libraries, museums, and archives around the world. By first examining your research interests, and then identifying related content in locations such as the Digital Public Library of America (DPLA), Europeana, and Flickr Commons, our serendipity engine helps you discover photographs, documents, maps and other primary sources."
The Virtual Romans App is a location-based virtual reconstruction which seeks to bring some aspects of Roman Leicester (Ratae Corieltauvorum) in the year 210 AD back to life.
Notable is the ability to change the lighting characteristics in 3D reconstructions.