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.
If anyone's near Huntsville, AL, the Space and Rocket Center has stacks of stuff for your gawking pleasure. Although I think the only F-1 you can go up and rub on is outside the MSFC main building, which you wouldn't get to unless you take a MSFC tour.
https://en.wikipedia.org/wiki/Rocketdyne_F-1#Locations_of_F-...
(The Apollo 11 command module is there, too!)