I don't know if this is what you saw but this is what I remember.
Cosmic Voyage is a 1996 short documentary produced in the IMAX format, directed by Bayley Silleck, produced by Jeffrey Marvin, and narrated by Morgan Freeman.
The film takes viewers on a journey through forty-two orders of magnitude, beginning at a celebration in Italy to zoom to the edge of the observable universe. The view descends back to earth, and later zooms in upon a raindrop on a leaf, to the level of sub-atomic particles ("quarks").
In addition, the film offers some brief insight on the Big Bang Theory, black holes, and the development of our Solar System. It also simulates a journey through Fermilab's Tevatron particle accelerator in Chicago, where an atom collision is depicted.
http://www.youtube.com/watch?v=Cy-LlaMZ058
That film is loosely based on this one:
Powers of Ten is a 1968 short documentary film written and directed by Ray Eames and her husband, Charles Eames. The film depicts the relative scale of the Universe in factors of ten.
The film begins with an overhead image of a man reclining on a blanket; the view is that of one meter across. The viewpoint, accompanied by expository voiceover by Philip Morrison, then slowly zooms out to a view ten meters across (or 101 m in standard form), revealing that the man is picnicking in a park with a female companion. The zoom-out continues (at a rate of one power of ten per 10 seconds), to a view of 100 meters (102 m), then 1 kilometer (103 m), and so on, increasing the perspective—the picnic is revealed to be taking place near Soldier Field on Chicago's lakefront—and continuing to zoom out to a field of view of 1024 meters, or the size of the observable universe. The camera then zooms back in at a rate of a power of ten per 2 seconds to the picnic, and then slows back down to its original rate into the man's hand, to views of negative powers of ten—10−1 m (10 centimeters), and so forth—until the camera comes to quarks in a proton of a carbon atom at 10−16 meter.
http://www.youtube.com/watch?v=A2cmlhfdxuY&feature=fvw