As I kid I remember taking the school bus to the Betty Crocker Headquarters, it was situated on several beautiful acres of apple trees. Don’t remember much of the tour but we ended up in the test kitchen. I was amazed because they were beautiful to me, and there were several working kitchens side by side.
I was on the Hamm’s Beer tour several times (FIL retired from there when it became Stroh’s). The tour ended on the top floor with the ceiling to floor glass view of the city. The Rathskeller in the sky.
But the most memorable would be the Chinese Fortune Cookie Factory in an alley in Chinatown, San Francisco. Batter was poured into a large old machine. Two chinese woman worked there, one with the batter the other sat and worked a press where the batter was "spit" onto a griddle. The woman would quickly retrieve the cookie and quickly fold it putting a fortune slip inside. They didn’t allow picture taking unless you paid to take a picture as stated on a sheet of notebook paper taped to the machine. The room was about 12×12. Fascinating.