(c) 2009, The Washington Post WASHINGTON -- Finding your way around the Smithsonian can be daunting. Never fear: Ben Stiller is here to help! The comic actor and star of the recent 'Night at the Museum: Battle of the Smithsonian' leads a new orientation video showing at the Smithsonian Castle on the Mall. The 12-minute overview of the Smithsonian's 19 museums is meant to get you on your way to spending a day, or several days, exploring some of the 136 million objects in the institution's holdings. Stiller injects a welcome dose of his goofball humor into a medium that's often worth no more than a peek as you collect the requisite pamphlets and guides. In fact, it's probably the silliest orientation video you'll find at a place as storied and august as the Smithsonian. 'It's a hall of fame of everything that matters,' Stiller proclaims, before pointing to a portrait of, well, a guy he doesn't recognize. Stiller might not know who it is (hint: he's our 13th president), but you might. Head to the Smithsonian Castle and find out. Smithsonian Castle, 1000 Jefferson Dr. SW, Washington. (202) 633-1000 or www.si.edu. 