
When it came out, my family enjoyed the film for more than one reason. While we liked the story itself (though perhaps not as much as the first film), we loved how this one takes place in our own backyard. Well, not literally: The film actually takes place in several of the Smithsonian museums on the National Mall in Washington, D.C.—which we visit frequently as we live in the DC Metro area.
One of the things that intrigued me most about the film was whether or not those networks of storage areas and tunnels in which Larry and his friends and enemies adventure were real. This week, Smithsonian sponsored an “Ask a curator” day on Twitter, so I asked about the tunnels—and they answered:
Actually we sort of do. There is a tunnel that connects Arts & Industries (closed) the Castle, @freersackler & @NMAfaTranslation? There is a tunnel that connects the Arts & Industries Building, the Smithsonian Castle, the Freer and Sackler Museums (which are also connected by a public tunnel that houses displays) and the National Museum of African Art.

By the way, the Smithsonian has an entire section on its web site focusing on the connections between the film and its museums, including a map and list of the artifacts that appeared in the movie and in which museums you can find them.
And, for what it’s worth, below are some photos I’ve taken of locations in the film.