What smells do you associate with holiness?
If not “holiness,” then let’s call it “sanctity.” “Austerity” could also work, I think. Whatever word you want to use, it’s the idea of being in a very large place where a lot of people do a lot of generally serious things in the name of something arguably intangible, and it has a unique smell. The government buildings I have been in don’t have that kind of smell (“why” is something others can argue), but synagogues, the right kind of churches, and museums definitely do.
Somewhere a while back, I read that the reason people love the smell of “old books” is because lignen- the fibrous matter in plants and trees that paper is made of- has compounds that decompose over time into a yellowish color and is related to vanillin, the compound that (you may have guessed) gives vanilla its smell and flavor. Synagogues and churches inevitably have a LOT of old books in them unless they are brand new. Hymnals, prayer books, and holy texts to service a whole congregation don’t come cheap, and there aren’t “new editions” of ancient vows and praise that require refreshing the stock. The same prayer books (ideally) serve generations. The next time you walk into a place of worship, it might be interesting to wonder who held your hymnal before you. What were they going through? What were they thinking, if anything? What did they pray for if they could? Were they praying for you?
The Black Hat Baker 