<http://schema.org/thumbnailUrl>
<http://cdn1.tnwcdn.com/wp-content/blogs.dir/1/files/2012/07/Art1-520x242.jpg>
<http://thenextweb.com/google/2012/07/10/google-maps-gets-cultured-as-indoor-mapping-arrives-at-more-than-20-us-museums/>