I had a chance to see an F-1 at the Destination Moon exhibit which just opened at the Museum of Flight in Seattle. It is astonishingly large. If you're in the area, or near one of the other (few) locations where they are on display, I would definitely recommend going.
https://en.wikipedia.org/wiki/Rocketdyne_F-1#Locations_of_F-...
(The Apollo 11 command module is there, too!)