National portrait gallery

A museum in London, England at St. Martin's off Trafalgar Square, it houses portrait paintings of famous, historically important British citizens, now totaling about 10,000 works. Selection is by significance of the sitter, not the artist. It opened in 1856, and is the first gallery/museum in the world dedicated solely to portraiture. Source: Wikipedia, http://en.wikipedia.org/wiki/National_Portrait_Gallery_%28London%29