Google Maps Photos - Geotagged

Google now maps relates photos by description (geotagging)
http://en.wikipedia.org/wiki/GeoTagging


Find 'Buckingham Palace' returns Map and Photos

This a form of Metadata where information about the data you search on is returned

Other possibilities for metadata are

Statistics (Area, Height, Volume)
Historic (This building was build in)
Structure (This Building is made from)
the list goes on...