The Motion Picture Association headquarters has the necklace from “Titanic,” a Dundie Award, and the Sorting Hat from “Harry Potter.” And you’ll be able to see it all soon.

D.C. Mayor Anthony Williams unveiled a new “key to the city” at his weekly press conference yesterday. The key is designed by a local architect and sculptor John Dreyfuss, and Mayor Williams proclaimed Feb. 9, 2005, as “John Dreyfuss Day” as a token of gratitude. The Examiner reported today in a piece not online that Dreyfuss explained his design, which features eight slots representing the city’s eight wards, this way: “No matter how sophisticated the…