If you and your family want to see the holiday movie: "Night At The Museum", why not make it an IMAX experience? The Smithsonian's Udvar-Hazy Center (near Dulles Airport) has special holiday showings 3-times daily, all week long. General Admission is $10 -- similar to other theatres but the HUGE screen is amazing. Looks like it's only showing through January 31 so hurry for your tickets...
For showtimes: http://www.nasm.si.edu/visit/theaters/