When I was in Cairo, Illinois, a few years ago the entire town smelled incredible. There's a soybean processor at the edge of town and I guess they were either drying or roasting soybeans.
The town I grew up in had a small commercial bakery. The town often smelled like cakes baking.
And, in the spring, when the wind was just right, coming up the river from the south east, you could smell chocolate from Hershey. Not from the plant, but from the cocoa bean hulls that they use as mulch all over the town.